Week 38 of 2025

September 15, 2025 (Monday) to September 21, 2025 (Sunday)

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ISO Week Number
Week 38
2025 · Week 38 of 52 total weeks

What dates are in Week 38 of 2025?

Week 38 of 2025 runs from September 15, 2025 (Monday) to September 21, 2025 (Sunday). This is the 38th week of the year according to the ISO 8601 standard, in which weeks start on Monday.

Mon
Sep 15
Day 258
Tue
Sep 16
Day 259
Wed
Sep 17
Day 260
Thu
Sep 18
Day 261
Fri
Sep 19
Day 262
Sat
Sep 20
Day 263
Sun
Sep 21
Day 264
Starts September 15, 2025 Monday · Day 258
Ends September 21, 2025 Sunday · Day 264
Duration 7 days 2025 · 52-week year

📅 Nearby weeks in 2025

Week 36Week 37Week 38Week 39Week 40

📋 All 52 weeks in 2025

12345·678910·1112131415·1617181920·2122232425·2627282930·3132333435·3637383940·4142434445·4647484950·5152

📆 Week 38 in other years

Week 38 · 2024Week 38 · 2026

🔧 Related tools

Week Number Calculator Date to Week 2025 Full Calendar

❓ Related questions about Week 38 of 2025

What day of the week is Sep 15?

Sep 15 is a Monday. It is the first day of Week 38 of 2025.

What day of the week is Sep 21?

Sep 21 is a Sunday. It is the last day of Week 38 of 2025.

What is the ISO week number for Sep 15?

Sep 15 is in Week 38 of 2025 according to ISO 8601.

What is the ISO week number for Sep 21?

Sep 21 is in Week 38 of 2025 according to ISO 8601.

❓ Frequently asked questions about Week 38 of 2025

What dates are in Week 38 of 2025?

Week 38 of 2025 runs from September 15, 2025 to September 21, 2025.

Which day of the year does Week 38 start on?

Week 38 of 2025 starts on September 15, 2025, the 258th day of 2025.

Does Week 38 of 2025 fall entirely within 2025?

Yes, all 7 days of Week 38 of 2025 fall within 2025.

How many weeks are in 2025?

2025 has 52 weeks according to ISO 8601.