September 2025 Calendar
September 2025 has 30 days, starting on a Monday and ending on a Tuesday. It spans ISO weeks 36–40, with 22 weekdays and 8 weekend days — and 6 public holidays across the 12 countries listed below.
September 2025 month grid
September 2025
| W | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| 36 | 1 Labour Day | 2 | 3 | 4 | 5 | 6 | 7 Independence Day · Full Moon 18:09 UTC · Clocks go forward: Chile |
| 37 | 8 | 9 | 10 | 11 | 12 | 13 | 14 Last Quarter 10:33 UTC |
| 38 | 15 Respect-for-the-Aged Day | 16 Independence Day | 17 | 18 | 19 | 20 | 21 New Moon 19:54 UTC |
| 39 | 22 September equinox | 23 Autumnal Equinox Day | 24 Heritage Day | 25 | 26 | 27 | 28 Clocks go forward: New Zealand |
| 40 | 29 First Quarter 23:54 UTC | 30 | 1 | 2 | 3 | 4 | 5 |
| 41 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
12 public holiday 🌑 🌓 🌕 🌗 moon phase (UTC date) clock change / equinox W = ISO week
Public holidays in September 2025
| Date | Holiday | Observed in |
|---|---|---|
| Labour Day | US, Canada | |
| Independence Day | Brazil | |
| Respect-for-the-Aged Day | Japan | |
| Independence Day | Mexico | |
| Autumnal Equinox Day | Japan | |
| Heritage Day | South Africa |
No national public holiday in September 2025 for the selected country.
National holidays only, from the open-source date-holidays dataset. States, provinces and regions add their own — see each country's holiday page for the full list and observances.
Moon phases
- Full Moon
- Last Quarter
- New Moon
- First Quarter
September equinox:
Times are shown in your time zone when JavaScript is on, UTC otherwise; near midnight the local date can differ. For moonrise and moonset see the moon pages for New York, London or Sydney.
Clock changes in September 2025
- Sunday, September 7 — clocks go forward in Chile (00:00 → 01:00)
- Sunday, September 28 — clocks go forward in New Zealand (02:00 → 03:00)
Local wall-clock times, from the IANA time zone database. How daylight saving time works.
September 2025 at a glance
- Days
- 30
- Weekdays
- 22
- Weekend days
- 8
- ISO weeks
- 36–40
- Day of year
- 244–273 of 365
- Quarter
- Q3
- Days left in 2025 after the 30th
- 92
- Friday the 13th
- No
The name: From the Latin septem, "seven": it was the seventh month of the early Roman calendar.
Working days by country
Monday–Friday minus national public holidays that fall on a weekday. Regional holidays are not subtracted.
Need a span that crosses months? Use the date and time calculator.
September 2025: common questions
How many working days are there in September 2025?
September 2025 has 22 weekdays (Monday to Friday) and 8 weekend days. In the United States, Labour Day (Mon, Sep 1) falls in the month, leaving 21 working days. The United Kingdom has no UK-wide bank holiday this month, so it has 22 working days (regional bank holidays in England, Scotland or Northern Ireland are not counted).
What week numbers are in September 2025?
September 2025 covers ISO weeks 36, 37, 38, 39, 40. ISO weeks start on Monday, so September 1, a Monday, falls in week 36.
When is the full moon in September 2025?
Sunday, September 7 at 18:09 UTC. The new moon is on Sunday, September 21.
Do the clocks change in September 2025?
On Sunday, September 7 clocks go forward one hour in Chile. On Sunday, September 28 clocks go forward one hour in New Zealand.
What day of the week does September 2025 start on?
September 2025 starts on a Monday and ends on a Tuesday (the 30th). It runs from day 244 to day 273 of the year.