September 2025 Calendar
A printable September 2025 calendar with US holidays marked. Print it below, or download it as a PDF, editable Word or Excel file.
September 2025 has 30 days, starts on a Monday, and covers ISO weeks 36–40. There are 21 working days and 8 weekend days.
About September 2025
September starts with Labor Day and shifts into autumn at the equinox around September 22. School is back in session and the pace picks up.
- Length: 30 days, from Monday September 1 to Tuesday September 30.
- Working days: 21 (168 working hours); 8 weekend days.
- Week numbers: ISO weeks 36–40; days 244–273 of the year, in Q3.
- Season & sky: a autumn (from the equinox) month, with 4 moon phases and the Sapphire birthstone.
Make it yours: want September on a designed background or with your own photo? Open it in the calendar maker, or download the fully editable Word version and type your events straight into the boxes.
Holidays & Observances in September 2025
| Date | Day | Holiday | |
|---|---|---|---|
| Sep 1 | Monday | Labor Day | Federal |
Moon Phases in September 2025
| Phase | Date | |
|---|---|---|
| ◯ | Full Moon | Sunday, September 7 |
| ◖ | Last Quarter | Monday, September 15 |
| ● | New Moon | Monday, September 22 |
| ◕ | First Quarter | Monday, September 29 |
September Facts
| Birthstone | Sapphire |
| Birth flowers | Aster & Morning Glory |
| Zodiac signs | Virgo (until September 22), then Libra |
| Season | autumn (from the equinox) |
| Quarter | Q3 2025 |
Print, Customize & Plan
- 🖨 Use the Print button above, or grab the PDF, Word or Excel download.
- 🎨 Add a designed background from our template gallery or your own photo in the calendar maker.
- 💼 Planning tools: working days in 2025 · days between dates · all 2025 formats.
- 📅 See the full 2025 yearly calendar or all 2025 holidays.
Notable Dates in September
| Date | Occasion | Type |
|---|---|---|
| varies | Labor Day (1st Monday) | holiday |
| Sep 8 | International Literacy Day | observance |
| Sep 11 | Patriot Day (USA) | observance |
| Sep 15 | International Day of Democracy | observance |
| Sep 17 | Constitution Day (USA) | observance |
| Sep 19 | Talk Like a Pirate Day | fun |
| Sep 21 | International Day of Peace | observance |
| varies | First Day of Autumn (Equinox) | astronomy |
| Sep 29 | National Coffee Day (USA) | fun |
September 2025 Calendar FAQ
How many days are in September 2025?
September 2025 has 30 days. It begins on a Monday and ends on a Tuesday.
How many working days are in September 2025?
There are 21 working days in September 2025 (about 168 working hours), after taking out weekends and any observed federal holidays. It also has 8 weekend days.
What week numbers does September 2025 cover?
September 2025 spans ISO weeks 36 through 40, covering days 244 to 273 of the year.
What holidays are in September 2025?
September 2025 includes Labor Day.
What day of the week is Labor Day 2025?
Labor Day 2025 falls on a Monday, September 1.