What Week: Week 25
Find the calendar dates covered by any ISO week number.
ISO Week 25 of 2026 runs from June 15 to June 21, 2026, with roughly 27 ISO weeks remaining in the year after it. ISO 8601 weeks always run Monday through Sunday and belong to the year containing that week's Thursday, which is why the first few days of January sometimes belong to the final week of the previous year. Juneteenth, Father's Day, the First Day of Summer fall within this week in 2026. Next year, 2027, the same week number runs from June 21 to June 27, 2027 instead, since the exact dates shift slightly every year.
As of October 1, 2026, 12:19 PM (America/New York).
Position in the Year
Week 25 falls in the first half of the year, roughly 48% of the way through 2026's 52-53 ISO weeks.
Quarter Overlap
This week sits in calendar Q2, based on its Monday (June 15).