Week 38 of 2026 runs September 14 to September 20

ISO week 38 of 2026 begins on Monday, September 14, 2026 and ends on Sunday, September 20, 2026. It has already passed; the current week is 39. The week covers September only.

What dates are in week 38?

No holiday or widely marked observance falls inside week 38 of 2026. 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 38 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 38 is the 38th Monday-to-Sunday block of 2026, which lands on September 14. All seven dates sit inside 2026, so the ISO year and the calendar year agree for this week.

When is week 38 in other years?

Week 38 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 September 14 in 2026 to September 20 in 2027.

How far away is week 38?

Today is Wednesday, September 23, 2026, which sits in ISO week 39 of 2026. Week 38 of 2026 closed 3 days ago. The same week number in the following year is listed in the table above.

Questions

What dates are in week 38 of 2026?

Monday September 14, 2026 through Sunday September 20, 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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