Week 25 of 2026 runs June 15 to June 21
ISO week 25 of 2026 begins on Monday, June 15, 2026 and ends on Sunday, June 21, 2026. It has already passed; the current week is 39. The week covers June only.
What dates are in week 25?
| Weekday | Date | Day of year | Notes |
|---|---|---|---|
| Monday | June 15, 2026 | 166 | |
| Tuesday | June 16, 2026 | 167 | |
| Wednesday | June 17, 2026 | 168 | |
| Thursday | June 18, 2026 | 169 | |
| Friday | June 19, 2026 | 170 | Juneteenth |
| Saturday | June 20, 2026 | 171 | |
| Sunday | June 21, 2026 | 172 | Father's Day |
Week 25 of 2026 contains Juneteenth on June 19 and Father's Day on June 21. The seven dates always run Monday through Sunday, which is the part of ISO 8601 that most often catches people out: a week that starts on Sunday is a different convention and gives a different number.
How ISO week 25 is worked out
ISO 8601 fixes week one as the week containing the first Thursday of January, which is the same as saying the week containing 4 January, or the week holding the majority of its days in the new year. Counting forward from there, week 25 is the 25th Monday-to-Sunday block of 2026, which lands on June 15. All seven dates sit inside 2026, so the ISO year and the calendar year agree for this week.
When is week 25 in other years?
| Year | Monday | Sunday | Weeks in year |
|---|---|---|---|
| 2026 | June 15 | June 21 | 53 |
| 2027 | June 21 | June 27 | 52 |
| 2028 | June 19 | June 25 | 52 |
| 2029 | June 18 | June 24 | 52 |
| 2030 | June 17 | June 23 | 52 |
Week 25 shifts by a day or two each year because a year is 52 weeks plus one or two days, so the Monday that opens it moves from June 15 in 2026 to June 21 in 2027.
How far away is week 25?
Today is Wednesday, September 23, 2026, which sits in ISO week 39 of 2026. Week 25 of 2026 closed 94 days ago. The same week number in the following year is listed in the table above.
Questions
- What dates are in week 25 of 2026?
- Monday June 15, 2026 through Sunday June 21, 2026.
- What week is it now?
- ISO week 39 of 2026. Today is Wednesday, September 23, 2026.
- How many weeks does 2026 have?
- 53. The 2026 week count page explains the rule.
- Do ISO weeks start on Monday or Sunday?
- Monday. A Sunday-first week is a different convention and can give a different week number for the same date.
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