September 2025 calendar
September 2025 starts on a Monday and has 22 weekdays. The autumn equinox is on Monday 22 September.
Bank holidayTodayWk = ISO week number
September 2025
| Wk | Mo | Tu | We | Th | Fr | Sa | Su |
|---|
| 36 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|
| 37 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
|---|
| 38 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |
|---|
| 39 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
|---|
| 40 | 29 | 30 | | | | | |
|---|
Key dates in September 2025
| Date | Occasion |
|---|
| Mon 22 Sep | Autumn equinox |
Schools in England, Wales and Northern Ireland usually go back in the first week of September. See school term dates.
September 2025 in numbers
- 30 days, from Monday 1 September 2025 to Tuesday 30 September 2025: days 244 to 273 of the year.
- 22 weekdays and 8 weekend days.
- 22 working days in England and Wales, 22 in Scotland and 22 in Northern Ireland.
- ISO weeks 36 to 40, from Monday 1 September to Sunday 5 October 2025.
- Quarter 3 of 2025.
See the full 2025 calendar, or go to August 2025 or October 2025. Also see the UK bank holidays list and today's week number.
Frequently asked questions
How many working days are in September 2025?
September 2025 has 22 weekdays and no bank holidays in England and Wales, so all 22 are working days.
What week numbers are in September 2025?
September 2025 covers ISO weeks 36 to 40. Week 36 starts on Monday 1 September 2025 and week 40 ends on Sunday 5 October 2025.