Week 36 in 2025
Week 36 of 2025 begins on September 1, 2025 and ends on September 7, 2025. It covers days 244 to 250 of the year and falls in quarter 3.
Weeks since this week: 58
Week 36 of 2025 at a glance
| Starts (Monday) | September 1, 2025 |
|---|---|
| Ends (Sunday) | September 7, 2025 |
| US week (Sunday to Saturday) | 36 (August 31, 2025) |
| Month | September |
| Quarter | Q3 |
| Days of the year | 244–250 |
| Year completed at the end of this week | 68.5% |
| Weeks left in 2025 after this week | 16 |
| Weeks in 2025 | 52 |
| Even or odd week | Even |
Calendar for September 2025
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(US version) (EU/ISO Version)
All Weeks in 2025:
Past & Future Week Number 36:
US and ISO week numbers
In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 36 of 2025. It runs from August 31, 2025 to September 6, 2025.
Even and odd weeks
Week 36 is an even week. Even and odd week numbers are used for alternating schedules such as shift rotas, school timetables, custody arrangements and waste collection.
Week 36 in other years
| From | To | |
|---|---|---|
| Week 36 in 2023 | September 4, 2023 | September 10, 2023 |
| Week 36 in 2024 | September 2, 2024 | September 8, 2024 |
| Week 36 in 2026 | August 31, 2026 | September 6, 2026 |
| Week 36 in 2027 | September 6, 2027 | September 12, 2027 |
How week numbers are counted
Most of the world numbers weeks according to the ISO 8601 standard. A week starts on Monday, and week 1 is the week that contains the first Thursday of the year, which is always the week that contains 4 January.
Week 1 of 2025 began on December 30, 2024. 2025 has 52 ISO weeks.
Because of this rule, the first days of January can belong to the last week of the previous year, and the last days of December can belong to week 1 of the next year.
In the United States, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the US week number can differ from the ISO week number.
Find the week number of a date
Frequently Asked Questions (FAQ)
When does week 36 of 2025 start and end?
Week 36 of 2025 starts on September 1, 2025 and ends on September 7, 2025 (ISO 8601, Monday to Sunday).
Which month is week 36 of 2025 in?
Week 36 of 2025 is in September.
What dates are in week 36 of 2025?
September 1, 2025, September 2, 2025, September 3, 2025, September 4, 2025, September 5, 2025, September 6, 2025, and September 7, 2025
How many weeks does 2025 have?
2025 has 52 ISO weeks.
Is week 36 an even or odd week?
Week 36 is an even week.
What is the US week number for this week?
In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 36 of 2025. It runs from August 31, 2025 to September 6, 2025.