When is week 40?
In 2026, week 40 runs from Monday, September 28, 2026 to Sunday, October 4, 2026.
That's this week.
Week 40 in other years
| Year | Starts | Ends |
|---|---|---|
| 2025 | Mon, Sep 29, 2025 | Sun, Oct 5, 2025 |
| 2026 | Mon, Sep 28, 2026 | Sun, Oct 4, 2026 |
| 2027 | Mon, Oct 4, 2027 | Sun, Oct 10, 2027 |
| 2028 | Mon, Oct 2, 2028 | Sun, Oct 8, 2028 |
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Questions & answers
What dates are in week 40?
In 2026, week 40 is September 28, 2026 to October 4, 2026.
How are week numbers counted?
We use ISO 8601 week numbers: weeks start on Monday, and week 1 is the week that contains the first Thursday of the year.