September 2026
30 daysStarts Tuesday, ends Wednesday21 working days8 weekend daysISO weeks 36–40
| ISO week | Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|---|
| 36 | |||||||
| 37 | |||||||
| 38 | |||||||
| 39 | |||||||
| 40 |
Holidays in September
- Labor DayMon, Sep 7 · Federal
- Patriot DayFri, Sep 11 · Federal
- National Grandparents DaySun, Sep 13 · Federal
Federal holidays from 5 U.S.C. §6103, plus widely kept US observances. 4 religious dates fall in September 2026 as well — see the calendar with every holiday.
Moon phases
- Last QuarterFri, Sep 4, 3:51 AM
- New MoonFri, Sep 11, 11:26 PM
- First QuarterFri, Sep 18, 4:43 PM
- Full MoonSat, Sep 26, 12:48 PM
Times in US Eastern. Computed from Meeus, Astronomical Algorithms, ch. 49.
The moon through September
- 1
- 3
- 5
- 7
- 9
- 11
- 13
- 15
- 17
- 19
- 21
- 23
- 25
- 27
- 29
- 30
About September 2026
September 2026 has 30 days. It begins on a Tuesday and ends on a Wednesday, which gives the month five Tuesdays and Wednesdays — and only four of every other weekday. Of its 22 weekdays, 1 is a federal holiday, leaving 21 working days.
Labor Day falls on Monday, September 7, 2026. Patriot Day falls on Friday, September 11, 2026. National Grandparents Day falls on Sunday, September 13, 2026.
The September equinox falls on Tuesday, September 22, 2026, the 22nd of the month.
The month runs from Tuesday, September 1, 2026 to Wednesday, September 30, 2026, spanning ISO weeks 36 to 40.