Week 39, 2026
ISO-8601 Standard Week
Week 39 of 2026 runs from September 21, 2026 to September 27, 2026, and 2026 has 53 weeks in total.
This week is still ahead. See the full 2026 calendar, or learn why some years have 53 weeks.
Starts On
Monday
September 21, 2026
Ends On
Sunday
September 27, 2026
This week marks approximately 72% of the year 2026 passed.
September 2026 Calendar
| Week | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| 36 | 31 | 1 | 2 | 3 | 4 | 5 | 6 |
| 37 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 38 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 39 | 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 40 | 28 | 29 | 30 | 1 | 2 | 3 | 4 |
Holidays in Week 39
Public Holidays Around the World in Week 39, 2026
- Mon, Sep 21 Respect for the Aged Day Japan
- Tue, Sep 22 National Holiday Japan
- Wed, Sep 23 Autumnal Equinox Japan
All Weeks in 2026
Week 39 in Other Years
Compare dates and holidays for week 39 across different years:
About Week 39
Week 39 of 2026 is a standard business week consisting of 7 days. It follows the ISO-8601 convention where Monday is the first day of the week.
Working Days
In most countries, this week contains 5 working days (Monday, September 21 to Friday, September 25) and a standard 2-day weekend.