September 2027 at a Glance
September functions as a second January. School terms start, businesses return from summer at full pace, and the final quarter comes into view. For many households it is the month with the sharpest jump in weekly commitments, which is why a visible monthly grid matters most here.
| Month | September 2027 — month 9 of 12 |
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| Number of days | 30 days |
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| First day | Wednesday, September 1, 2027 |
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| Last day | Thursday, September 30, 2027 |
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| Weekend days | 8 Saturdays and Sundays |
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| Calendar weeks | Spans 5 rows (ISO weeks 35–39) |
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| Season | Early Autumn in the Northern Hemisphere |
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| Birthstone | Sapphire |
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| Birth flower | Aster & Morning Glory |
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| Zodiac signs | Virgo (until Sep 22) & Libra (from Sep 23) |
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Holidays and Observances in September 2027
September 2027 contains 1 federal holiday: Labor Day on Monday, September 6.
The rest of September resets the year's rhythm: Patriot Day on the 11th, Constitution Day on the 17th, and the autumn equinox around the 22nd. School terms are fully underway and Q4 budgets are usually finalised before the month ends.
| Date | Day | Holiday | Type |
|---|
| September 6, 2027 | Monday | Labor Day | Federal holiday |
| September 11, 2027 | Saturday | Patriot Day | Observance |
| September 17, 2027 | Friday | Constitution Day | Observance |
| September 22, 2027 | Wednesday | First Day of Fall | Observance |
See every date for the year on our 2027 holidays page, or browse the full
2027 calendar.
Planning Tips for September 2027
Rebuild the weekly template
Autumn schedules are denser than summer ones. Draft a single typical week — school runs, practices, lessons, work blocks — then copy it across September before the exceptions start piling up.
Plan the last quarter now
September is the last comfortable month to shape October through December. Holiday travel, year-end deadlines and school breaks are all easier to arrange eight weeks out than three.
Watch the Labor Day compression
The short first week means the month's workload gets squeezed into fewer working days. Deadlines set for mid-September deserve a check against the actual dates.
How Many Working Days Are in September 2027?
September 2027 contains 21 working days once weekends and federal holidays are
removed from its 30 calendar days. The 1 federal holiday that falls on a weekday is: Labor Day. These figures assume a standard Monday-to-Friday schedule;
shift and weekend workers will count differently.
30Total days
22Weekdays
8Weekend days
21Working days
| Calendar days | 30 |
|---|
| Weekdays (Mon–Fri) | 22 |
|---|
| Weekend days | 8 |
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| Federal holidays on a weekday | 1 |
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| Working days | 21 |
|---|
Payroll periods, project estimates and billable-hour targets all depend on this number, and it varies by
several days from month to month — which is why estimating "about 22 days" every month quietly
distorts a quarter's planning.
Week Numbers in September 2027
September 2027 spans ISO week 35 through week 39. Under the ISO 8601 standard used across Europe and by
most project-management and payroll software, weeks run Monday to Sunday and week 1 is the week containing the
first Thursday of the year.
| Week number | Starts (Monday) | Ends (Sunday) |
|---|
| Week 35 | August 30 | September 5 |
| Week 36 | September 6 | September 12 |
| Week 37 | September 13 | September 19 |
| Week 38 | September 20 | September 26 |
| Week 39 | September 27 | October 3 |
If your workplace refers to "week 35" or "W39", these are the dates it means.
Our guide to how many weeks are in a year explains why some years
carry 53 numbered weeks and how the ISO rule decides where week 1 begins.
Note that American calendars usually start the week on Sunday, so a US week-of-the-year count can differ by one
from the ISO numbering above — you can switch the grid between Sunday and Monday starts using the
Week starts menu above.
How to Print Your September 2027 Calendar
1
Choose your month
Use the arrows or the month and year menus to open any month between 2024 and 2030. The grid updates instantly.
2
Add your plans
Click straight into any date box and start typing. Appointments, shifts, birthdays and reminders are saved
automatically in your browser, so nothing is lost if you close the page.
3
Print or download
Hit Print for a clean paper copy, PDF to save a document, or
Image for a PNG you can share. All three are free and never watermarked.
For the clearest printed result, choose landscape orientation and
enable background graphics in your printer settings so the header row and holiday highlights appear. If you
prefer a calendar you fill in by hand, our blank calendar templates give you the
same layout without any dates.
Other Calendars You Might Need
You can also open the evergreen September calendar hub for
templates covering every year, or browse all 2027 months in one place.