September 2027 Calendar
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September 2027 at a glance
| Wk | Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|---|
| 35 | 1 | 2 | 3 | 4 | |||
| 36 | 5 | 6 Labor Day | 7 | 8 | 9 | 10 | 11 Patriot Day |
| 37 | 12 National Grandparents Day | 13 | 14 | 15 | 16 | 17 | 18 |
| 38 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 39 | 26 | 27 | 28 | 29 | 30 |
About September 2027
September 2027 has 30 days. It starts on a Wednesday and ends on a Thursday, with 22 weekdays (Monday to Friday) and 21 federal working days once the holiday is taken out. The month covers ISO weeks 35 to 39 and days 244 to 273 of the year (quarter 3).
Federal holiday this month: Labor Day on Monday, September 6, 2027 (the first Monday in September).
Long weekend: Sat, Sep 4 to Mon, Sep 6 (Labor Day).
The September equinox is on Thursday, September 23, 2027 at 2:01 a.m. EDT, the astronomical start of fall. The full moon falls on Wed, Sep 15 (Harvest Moon, 7:04 p.m. EDT).
Holidays and observances in September 2027
| Date | Holiday | Type |
|---|---|---|
| Mon, Sep 6 | Labor DayFederal offices, banks and most post offices closed. | Federal holiday |
| Sat, Sep 11 | Patriot Day | Observance |
| Sun, Sep 12 | National Grandparents Day | Observance |
Moon phases in September 2027
- First Quarter: Tue, Sep 7 at 2:31 p.m. EDT
- Full Moon: Wed, Sep 15 at 7:04 p.m. EDT
- Last Quarter: Thu, Sep 23 at 6:21 a.m. EDT
- New Moon: Wed, Sep 29 at 10:36 p.m. EDT
Questions and answers
What day does September 2027 start on?
September 2027 starts on Wednesday, September 1, 2027 and ends on Thursday, September 30, 2027.
How many working days are in September 2027?
There are 22 weekdays in September 2027. Taking out the federal holiday leaves 21 working days for federal offices. Private employers set their own holidays.
What holidays are in September 2027?
Federal: Labor Day (Mon, Sep 6). Other dates: Patriot Day (Sat, Sep 11), National Grandparents Day (Sun, Sep 12).
What week numbers are in September 2027?
September 2027 covers ISO weeks 35 to 39. ISO weeks start on Monday, and week 1 is the week with the year's first Thursday.
Holidays: U.S. Office of Personnel Management, Federal Holidays (5 U.S.C. 6103), last checked October 17, 2026. Moon phases calculated with Astronomy Engine, US Eastern Time. Unofficial calendar for planning; check with your employer or agency.