Week 40 of 2026 runs September 28, 2026 to October 4, 2026.
Week 40 starts on Monday, September 28, 2026 and ends on Sunday, October 4, 2026. It's the 271st day of the year, sits in Q3, and falls in September / October. By the end of this week, 277 of 365 days are gone, putting 2026 at 75.9%.
There are no public holidays this week, so all 5 weekdays are working days. Need a different week? Browse the full 2026 week calendar, or jump to this week's number.
Week 40 at a glance
The 7 days of week 40
Every date in week 40 of 2026, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 271 | Weekday | ||
| Tuesday | Day 272 | Weekday | ||
| Wednesday | Day 273 | Weekday | ||
| Thursday | Day 274 | Weekday | ||
| Friday | Day 275 | Weekday | ||
| Saturday | Day 276 | Weekend | ||
| Sunday | Day 277 | Weekend |
What week 40 of 2026 means
ISO 8601 numbers weeks so every week starts on Monday and ends on Sunday. Week 1 is the one holding the year's first Thursday, which is why early January can land in week 52 or 53 of the previous year. Week 40 is one piece of that system.
In 2026, week 40 covers Sep 28 – Oct 4, 2026. That's September / October, deep in Q3. The same week number shifts by a day or two each year, so week 40 in 2027 won't share these exact dates. The table below shows how it moves.
Want to check a specific date instead of a week number? The week calculator converts any date to its ISO week. Curious how many weeks a year holds? The weeks in a year guide explains 52 versus 53. And the ISO week number page covers the standard end to end.
Holidays in week 40 of 2026
🇨🇦 Canada
National Day for Truth and Reconciliation
FederalWeek 40 across years
The same ISO week number lands on different dates each year. Here's how week 40 shifts.
Week 40 of 2026: questions and answers
What days are in week 40 of 2026?
Week 40 of 2026 runs from September 28, 2026 (Monday) through October 4, 2026 (Sunday). It spans September / October.
What month is week 40 in 2026?
Week 40 of 2026 spans two months: it starts in September and ends in October 2026.
How many working days are in week 40 of 2026?
Week 40 of 2026 has 5 working days.
What quarter is week 40 of 2026 in?
Week 40 of 2026 is in Q3 (2026). The week starts on day 271 of 365.
What is ISO week 40?
ISO week 40 is defined by the ISO 8601 international standard. It begins on Monday, September 28, 2026, and ends on Sunday, October 4, 2026. It is week 75% through the ISO year 2026.