September Calendar: Holidays, Important Dates & Planning Guide

September is the ninth month of the year and has 30 days. In the United States it marks the shift from summer to fall, the return to school for most families, and the run-up to the final quarter of the year. Labor Day is the one federal holiday in September, but the month is packed with other observances, planning milestones, and seasonal changes worth knowing about.

This guide covers what September is known for, the holidays and observances that fall in the month, how different groups can use September to plan the rest of the year, and where to find the exact printable calendar for the September you need.

September at a Glance

September is a 30-day month that sits in the third quarter of the year. Here are the fixed facts that stay true every year:

Year-specific facts like the exact weekday September 1 falls on, the number of Saturdays and Sundays, or the observed date of Labor Day depend on the year you are looking at. For those details, use the printable calendar for the specific year you need. Links are further down in this guide.

September Holidays in the USA

September has one federal holiday and several important national and cultural observances. It helps to understand the difference between them before planning around them.

Labor Day (Federal Holiday)

Labor Day is the one federal holiday in September. It falls on the first Monday of the month, so the date shifts every year but always creates a three-day weekend. The holiday honors the American labor movement and the contributions of workers to the country. Federal offices, most banks, the stock market, and many businesses close on Labor Day. Public schools that are already back in session usually take the day off.

Because Labor Day falls on a Monday by design, it is one of the most reliable long weekends of the year for travel, family gatherings, and end-of-summer events.

Patriot Day (National Observance)

Patriot Day is observed every year on September 11 to remember the victims of the 2001 attacks. It is a national day of service and remembrance, but it is not a federal holiday. Government offices, banks, and businesses stay open. Flags are flown at half-staff on federal buildings.

Constitution Day and Citizenship Day (National Observance)

Constitution Day is observed on September 17, the anniversary of the signing of the US Constitution in 1787. Schools that receive federal funding are required to teach lessons about the Constitution on this day. It is a national observance, not a federal holiday, so it does not affect work or bank schedules.

National Hispanic Heritage Month (Awareness Observance)

National Hispanic Heritage Month runs from September 15 to October 15 each year. The starting date lines up with the independence anniversaries of several Latin American countries, including Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua on September 15, and Mexico on September 16. Schools, museums, workplaces, and cultural organizations mark the month with events, exhibits, and educational programs.

Other Notable September Observances

September also contains a long list of awareness days and cultural observances that vary in visibility. A few worth knowing:

• National Suicide Prevention Month runs through September, with World Suicide Prevention Day on September 10.
• National Preparedness Month is a federal awareness campaign encouraging emergency planning.
• POW/MIA Recognition Day falls on the third Friday of September and honors American prisoners of war and those missing in action.
• Grandparents Day is observed on the first Sunday after Labor Day.
• Rosh Hashanah and Yom Kippur often fall in September, though the dates shift each year with the Hebrew calendar.

State-specific holidays and observances also fall in September, and the list varies from state to state. For the exact holidays that apply to a specific year, check the month calendar for that year.

September Calendars by Year

Every September has the same 30 days, but the weekdays those days fall on, the date of Labor Day, and the exact holiday schedule all change each year. Use the year-specific calendar below for the exact layout, weekday counts, and holiday dates.

Each year-specific page includes the full month grid, exact weekday counts, holiday dates for that year, and free PDF and PNG downloads.

What Is September Known For?

September is a bridge month. Summer is winding down, fall is starting, and most of the country resets its rhythm. A few themes define the month in the United States:

• Labor Day weekend. The first weekend of September signals the unofficial end of summer for many families, with cookouts, road trips, and lake or beach trips before the season closes.
• Back to school. Most public schools in the US start their academic year in August or the first week of September. By mid-September, nearly every school district is back in session, which changes traffic patterns, retail schedules, and family routines.
• Fall arrival. The autumnal equinox usually falls on September 22 or 23. Temperatures start dropping in northern states, leaves begin to turn in the northeast, and pumpkin-spice season begins in earnest.
• Football season. NFL regular season kicks off in early September, and college football is in full swing. This shapes weekend routines for millions of households.
• Hispanic Heritage Month. Cultural events, food festivals, and educational programming run from September 15 through October 15.
• Q4 planning. Businesses use September to close out the third quarter and prepare for the crucial fourth quarter, which usually drives the biggest share of annual revenue.

What Season Is September?

September falls across two seasons depending on where you live and which definition you use.

In the Northern Hemisphere, September starts in summer and shifts to fall partway through the month. The exact turning point depends on which system you follow:

• Astronomical fall begins at the autumnal equinox, which usually falls on September 22 or 23 in any given year.
• Meteorological fall begins on September 1 and runs through November 30. Meteorologists use this system because it lines up more neatly with weather patterns and makes seasonal data easier to compare year to year.

In the Southern Hemisphere, the seasons are flipped. September marks the transition from winter to spring. September 1 is the meteorological start of spring, and the September equinox is the astronomical start of spring.

September Weather in the USA

September weather varies dramatically across the United States, so any general description leaves out most of the picture. Here is what you can broadly expect by region.

• Northeast. September usually brings cooler mornings and mild afternoons. Foliage starts changing in northern New England by late month.
• Midwest. Late summer heat gives way to cooler weather. Thunderstorms are still possible early in the month, and the first frost can arrive in northern states by the end of September.
• South. Much of the South stays warm and humid through September. Hurricane season peaks in September along the Gulf and Atlantic coasts.
• Southwest. Monsoon season is winding down in Arizona and New Mexico. Temperatures start dropping from the summer peak.
• West. The Pacific Northwest cools quickly and rain returns after a dry summer. California often stays warm through September, and wildfire risk remains high in many western states.

For local forecasts, always check the National Weather Service or your local weather source. The details above are general seasonal patterns, not predictions.

What to Plan in September

September is one of the best planning months of the year because it sits at the front of Q4 and gives you time to line up the last three months before the calendar turns. A few things worth putting on your September calendar:

• Labor Day weekend travel or family plans
• School start dates, teacher meetings, and open house nights
• Fall clothing and supply shopping for kids
• Annual medical, dental, and eye appointments before year-end insurance resets
• Home tasks like gutter cleaning, HVAC service, and yard prep before winter
• Financial check-ins including retirement contributions and tax planning
• Holiday travel booking for Thanksgiving and Christmas, which fills up fast
• Q4 work goals and personal goals
• October, November, and December calendar prep

A printable monthly calendar makes it easier to see the whole month at once and spot conflicts between school events, work deadlines, and family plans. For the current September, use the calendar page for the specific year you need.

September Planning for Professionals

September is the first month of the final push toward year-end. It is a good time to close the books on Q3 and set up Q4 for success.

• Close out Q3. Wrap up outstanding deliverables, invoice open work, and document what worked and what did not.
• Set Q4 priorities. Identify the two or three outcomes that will define a successful fourth quarter and build your calendar around them.
• Review remaining vacation days. Many US employers do not carry over unused PTO. September is the last realistic month to book December time off with your team.
• Prepare for year-end reviews. Start gathering evidence of your accomplishments now so the review process is easy in December.
• Plan around holiday closures. Thanksgiving, Christmas Eve, and Christmas Day cut into November and December work weeks. Deadlines that fall in those weeks need earlier internal drafts.
• Confirm budgets. If your fiscal year matches the calendar year, September is when to lock down Q4 spending and start planning the next annual budget.

Career Planning in September

September is one of the strongest months for career activity. Hiring picks up after the summer slowdown, companies finalize headcount plans for Q4 and the coming year, and networking events return in force after August.

• Update your resume and LinkedIn profile with recent accomplishments from Q3.
• Set specific career goals for Q4 and identify one or two skills to develop before year-end.
• Enroll in a certification program that finishes before December if you want a credential to show on year-end reviews or job applications.
• Reconnect with former colleagues and managers. September is a natural check-in time after summer.
• Attend fall industry conferences, both in person and online. Many happen in September and October.
• Start or refresh a job search if you are considering a change. Companies with January fiscal starts often hire aggressively in Q4 to build teams for the new year.
• Prepare for your year-end performance review conversation. Draft your talking points in September, not December.

September Planning for Students

For most students, September is the busiest planning month of the year. New classes, new schedules, new assignments, and often new schools all land at once.

• Write every class time, location, and instructor into a monthly calendar so the first week runs smoothly.
• Add every syllabus due date to your calendar in one sitting instead of week by week. This shows you which weeks are heavy long before they arrive.
• Block out exam dates and set study milestones two weeks before each exam.
• Add extracurricular practices, club meetings, and game or performance dates.
• For high school seniors, mark college application deadlines. Many early-action deadlines fall in November, so September is your prep month.
• For college students, mark the last day to add or drop classes and any tuition or housing deadlines.
• Set a weekly review time to check the coming two weeks and adjust your study plan.

September Planning for Businesses

For businesses, September is a bridge between the summer slowdown and the make-or-break fourth quarter. The right September planning can shape the entire rest of the year.

Retailers especially treat September as the last quiet planning window before the holiday shopping season, which often starts before Halloween.

September Content and Marketing Ideas

If you publish content or run marketing, September has strong hooks that work across almost every industry. A few themes worth planning around:

• Labor Day. Sales, promotions, and last-summer content perform well in the first week.
• Back to school. Even brands with no education angle can play on new-routine, fresh-start, and get-organized themes.
• Fall arrival. Seasonal product launches, decor, food, and lifestyle content pick up momentum from mid-September.
• Hispanic Heritage Month. Authentic cultural celebration, spotlight features, and partner content run from September 15 through October 15. Do this with care and real research, not surface-level references.
• Q4 preparation. Business-to-business audiences respond well to Q4 planning guides, year-end checklists, and forward-looking analysis published in September.
• September equinox. Wellness, mindfulness, and lifestyle content around the shift from summer to fall.
• Football kickoff. Food, beverage, retail, and sports-adjacent brands can time content around the start of the NFL and college football seasons.

Things to Do in September

September is a rewarding month for seasonal activities in most parts of the US. A few ideas:

• Visit apple orchards and pumpkin patches, which open in most northern states by mid-month.
• Attend county and state fairs, many of which run through Labor Day weekend.
• Take a hike to catch the first fall foliage in the northeast and upper Midwest.
• Watch the harvest moon, which is the full moon closest to the September equinox.
• Clean and organize your home before the outdoor season closes.
• Start winter prep tasks like servicing heating systems, cleaning gutters, and putting away summer equipment.
• Plant fall garden vegetables and cool-season flowers in appropriate hardiness zones.
• Cook with peak-season produce like apples, pears, grapes, corn, tomatoes, and squash.
• Attend local Hispanic Heritage Month events in your city or town.

Gardening in September

September gardening depends heavily on your location. USDA hardiness zone, first frost date, and rainfall patterns all shape what makes sense in your yard. Here are general activities to consider, but check a local extension service or trusted regional guide before planting.

• Cool-season vegetables. Lettuce, spinach, kale, radishes, and other cool-season crops can go in the ground in many zones for a fall harvest.
• Fall bulbs. September is often the right time to start planning spring bulb planting for October and November.
• Lawn care. Cool-season grasses respond well to September overseeding, aeration, and fertilization in many regions.
• Garden cleanup. Remove spent summer plants, compost healthy material, and prepare beds for winter cover crops or mulch.
• Perennial care. Divide crowded perennials and transplant them while the soil is still warm.
• Tool maintenance. Clean, sharpen, and store summer tools before you need winter equipment.

Southern gardeners have a longer growing season and may still be harvesting warm-weather crops in September. Northern gardeners in colder zones may need to focus on cleanup and frost protection rather than planting.

Seasonal Foods in September

September is one of the best months for fresh produce in the US. Farm stands and farmers markets are typically at peak variety before the growing season winds down. Common in-season foods include:

• Apples of many varieties, from tart Granny Smiths to sweet Honeycrisp
• Pears, including Bartlett and Bosc
• Grapes, including Concord grapes in eastern states
• Sweet corn, especially early in the month
• Tomatoes at the tail end of their peak
• Winter squash including butternut, acorn, and delicata
• Early pumpkins for baking and decoration
• Figs in warmer regions
• Fresh herbs before the first frost

September Birthstone, Birth Flowers and Zodiac

September Birthstone

The birthstone for September is sapphire. Traditional sapphires are deep blue, but the gem occurs naturally in many colors, including pink, yellow, and orange. Sapphires have been associated with wisdom, loyalty, and nobility for centuries.

September Birth Flowers

September has two birth flowers:

• Aster. A daisy-like flower that blooms in late summer and early fall. Asters come in shades of purple, pink, white, and blue, and they symbolize love and wisdom.
• Morning glory. A climbing vine known for its trumpet-shaped flowers that open in the morning and close by afternoon. Morning glories symbolize affection.

September Zodiac Signs

September covers two zodiac signs in the tropical zodiac used in most Western astrology:

• Virgo covers birthdays from August 23 through September 22.
• Libra covers birthdays from September 23 through October 22.

How Many Days Are in September?

September has 30 days. That works out to four full weeks plus two additional days.

The exact number of Saturdays, Sundays, and weekdays depends on which weekday September 1 falls on in a given year. Some Septembers have five Saturdays, others have four. Some have five Sundays, others have four. To see the exact counts for a specific year, visit the September calendar page for that year using the table earlier in this guide.

When Does September Start and End?

September always begins on September 1 and always ends on September 30. What changes each year is the weekday those two dates fall on, which is why every September looks a little different when you print it.

For the exact starting weekday, ending weekday, and full calendar layout for a particular year, use the year-specific September calendar page linked earlier in this guide.

Printable September Calendar

A printable September calendar is one of the simplest tools for keeping the month organized. It shows the whole month at a glance, which makes it easier to spot conflicts, plan around long weekends, and see how school, work, and personal events fit together.

Common uses include:

• Work schedules and shift planning
• School and class schedules
• Medical, dental, and other appointments
• Family events and birthdays
• Project deadlines and milestones
• Vacation and travel planning
• Habit and goal tracking
• Bills, subscriptions, and financial reminders

Monthly-Calendar.com offers free printable September calendars in PDF and PNG format for every year from 2023 through 2035. No signup or email is required. Choose the year you need from the table earlier in this guide.

Planning September for Different Needs

Families

Families juggle school schedules, sports and activity calendars, medical appointments, and household planning all at once in September. A shared monthly calendar helps everyone see the same picture. Mark school events, appointments, and family activities in the first week of September and review the coming two weeks every Sunday.

Students

Students face the heaviest calendar load in September of any month. Put class times, assignment deadlines, exam dates, and extracurricular commitments on your calendar in the first week, before the workload picks up. This makes the busy weeks in October and November far easier to manage.

Professionals

September is the start of the Q4 sprint. Use the month to close out Q3 cleanly, set Q4 priorities, and plan around holiday closures that will cut into November and December work weeks.

Businesses

Businesses use September to prepare for the highest-volume quarter of the year for many industries. Marketing, sales, staffing, inventory, and content planning all benefit from an early September start rather than a late October scramble.

Travelers

Labor Day weekend is one of the busiest travel weekends of the year in the US. After that, September becomes one of the best months to travel because kids are back in school, popular destinations are less crowded, and many places offer shoulder-season pricing. September is also a strong month to book Thanksgiving and Christmas travel before prices climb.

Related Monthly Calendar Guides

Every month has its own set of holidays, planning themes, and seasonal patterns. Related guides in this series cover the same ground for other months of the year. As we publish new monthly guides, they will be linked from here.

For now, you can browse the full calendar for any month and year at the Monthly-Calendar.com homepage, or build a fully customized calendar with the Custom Calendar Maker.