Week 31 2026: Jul 27 – Aug 2
When is week 31? The exact Monday–Sunday dates of ISO week 31 for every year from 2024 to 2032.
Week 31 of 2026 runs from Monday, Jul 27, 2026 to Sunday, Aug 2, 2026 (Jul / Aug). In 2027, week 31 runs from Monday, Aug 2, 2027 to Sunday, Aug 8, 2027. ISO week code: 2026-W31.
The seven days of week 31
| Date | ISO week date | Day of year | Holidays |
|---|---|---|---|
| Monday, July 27, 2026 | 2026-W31-1 | 208 | — |
| Tuesday, July 28, 2026 | 2026-W31-2 | 209 | — |
| Wednesday, July 29, 2026 | 2026-W31-3 | 210 | — |
| Thursday, July 30, 2026 | 2026-W31-4 | 211 | — |
| Friday, July 31, 2026 | 2026-W31-5 | 212 | — |
| Saturday, August 1, 2026 | 2026-W31-6 | 213 | — |
| Sunday, August 2, 2026 | 2026-W31-7 | 214 | — |
Day-of-year numbers and common US and international holidays. Weekday digits in the ISO week date run 1 (Monday) to 7 (Sunday).
Week 31 dates by year
| Year | Week 31 starts (Mon) | Week 31 ends (Sun) | Month |
|---|---|---|---|
| 2024 | Monday, July 29, 2024 | Sunday, August 4, 2024 | Jul / Aug |
| 2025 | Monday, July 28, 2025 | Sunday, August 3, 2025 | Jul / Aug |
| 2026 | Monday, July 27, 2026 | Sunday, August 2, 2026 | Jul / Aug |
| 2027 | Monday, August 2, 2027 | Sunday, August 8, 2027 | August |
| 2028 | Monday, July 31, 2028 | Sunday, August 6, 2028 | Jul / Aug |
| 2029 | Monday, July 30, 2029 | Sunday, August 5, 2029 | Jul / Aug |
| 2030 | Monday, July 29, 2030 | Sunday, August 4, 2030 | Jul / Aug |
| 2031 | Monday, July 28, 2031 | Sunday, August 3, 2031 | Jul / Aug |
| 2032 | Monday, July 26, 2032 | Sunday, August 1, 2032 | Jul / Aug |
All weeks
Frequently asked questions
What month is week 31 in?
Week 31 typically falls in August. 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 31 as a week code?
The ISO code is the year plus W31 — for example 2026-W31, short form 26W31, or YYWW date code 2631. 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.