Week 39 of the year
When is week 39? The exact Monday–Sunday dates of ISO week 39 for every year from 2024 to 2032.
Week 39 of 2026 runs from Monday, Sep 21, 2026 to Sunday, Sep 27, 2026 (September). Week 39 of 2026 is 10 weeks away. ISO week code: 2026-W39.
Week 39 dates by year
| Year | Week 39 starts (Mon) | Week 39 ends (Sun) | Month |
|---|---|---|---|
| 2024 | Monday, September 23, 2024 | Sunday, September 29, 2024 | September |
| 2025 | Monday, September 22, 2025 | Sunday, September 28, 2025 | September |
| 2026 | Monday, September 21, 2026 | Sunday, September 27, 2026 | September |
| 2027 | Monday, September 27, 2027 | Sunday, October 3, 2027 | Sep / Oct |
| 2028 | Monday, September 25, 2028 | Sunday, October 1, 2028 | Sep / Oct |
| 2029 | Monday, September 24, 2029 | Sunday, September 30, 2029 | September |
| 2030 | Monday, September 23, 2030 | Sunday, September 29, 2030 | September |
| 2031 | Monday, September 22, 2031 | Sunday, September 28, 2031 | September |
| 2032 | Monday, September 20, 2032 | Sunday, September 26, 2032 | September |
All weeks
Frequently asked questions
What month is week 39 in?
Week 39 typically falls in Sep / Oct. The exact dates shift by up to a few days from year to year because week 1 is anchored to January 4, not January 1.
How do I write week 39 as a week code?
The ISO code is the year plus W39 — for example 2026-W39, short form 26W39, or YYWW date code 2639. See week number formats.
Are these dates the same in every country?
Yes for ISO 8601 (Monday-start) numbering, which is what this table shows. US Sunday-start calendars can label the same days with a number one higher — see week start conventions.