September 2025 calendar
30 days, starting on a Monday, with US holidays and ISO week numbers marked.
September 2025
| Wk | Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|---|---|---|---|---|---|---|
| 35 | Sunday, 31 August 2025 | Monday, 1 September 2025 | Tuesday, 2 September 2025 | Wednesday, 3 September 2025 | Thursday, 4 September 2025 | Friday, 5 September 2025 | Saturday, 6 September 2025 |
| 36 | Sunday, 7 September 2025 | Monday, 8 September 2025 | Tuesday, 9 September 2025 | Wednesday, 10 September 2025 | Thursday, 11 September 2025 | Friday, 12 September 2025 | Saturday, 13 September 2025 |
| 37 | Sunday, 14 September 2025 | Monday, 15 September 2025 | Tuesday, 16 September 2025 | Wednesday, 17 September 2025 | Thursday, 18 September 2025 | Friday, 19 September 2025 | Saturday, 20 September 2025 |
| 38 | Sunday, 21 September 2025 | Monday, 22 September 2025 | Tuesday, 23 September 2025 | Wednesday, 24 September 2025 | Thursday, 25 September 2025 | Friday, 26 September 2025 | Saturday, 27 September 2025 |
| 39 | Sunday, 28 September 2025 | Monday, 29 September 2025 | Tuesday, 30 September 2025 | Wednesday, 1 October 2025 | Thursday, 2 October 2025 | Friday, 3 October 2025 | Saturday, 4 October 2025 |
Weeks start on Sunday. Open it in the calendar to start on Monday, add events or print.
- Days
- 30
- Weekdays
- 22
- Weekend days
- 8
- ISO weeks
- 36–40
- Starts on
- Monday
- Ends on
- Tuesday
- Labor Day (US) Monday, 1 September 2025· federal
September 2025 has 30 days. It opens on a Monday and closes on a Tuesday, so the grid above runs to 5 rows when the week starts on Sunday.
September 2025 has one holiday or observance: Labor Day (US) (Monday, 1 September 2025).
The week numbers in the left-hand column are ISO 8601 weeks, the numbering most of Europe uses for planning and payroll. September 2025 covers weeks 36, 37, 38, 39 and 40.
To start the week on Monday, write events onto days or print a blank grid, open September 2025 in the calendar. Events you add stay in your browser.
What day does September 2025 start on?
September 2025 starts on a Monday and ends on Tuesday the 30th.
How many working days are in September 2025?
22 Monday-to-Friday days, and 8 weekend days. 1 US federal holiday falls on a weekday, so an office that closes for them is open 21 days. An office may also close on the observed day when a federal holiday falls at the weekend.
What holidays are in September 2025?
September 2025 has one holiday or observance: Labor Day (US) (Monday, 1 September 2025).
What week numbers does September 2025 cover?
ISO weeks 36, 37, 38, 39 and 40. ISO weeks start on Monday, and week 1 is the week holding the year's first Thursday, so a month's first or last days can belong to a week numbered in the neighbouring year.