Week 43 of 2025 runs October 20, 2025 to October 26, 2025.
Week 43 starts on Monday, October 20, 2025 and ends on Sunday, October 26, 2025. It's the 293rd day of the year, sits in Q4, and falls in October. By the end of this week, 299 of 365 days are gone, putting 2025 at 81.9%.
There are no public holidays this week, so all 5 weekdays are working days. Need a different week? Browse the full 2025 week calendar, or jump to this week's number.
Week 43 at a glance
The 7 days of week 43
Every date in week 43 of 2025, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 293 | Weekday | ||
| Tuesday | Day 294 | Weekday | ||
| Wednesday | Day 295 | Weekday | ||
| Thursday | Day 296 | Weekday | ||
| Friday | Day 297 | Weekday | ||
| Saturday | Day 298 | Weekend | ||
| Sunday | Day 299 | Weekend |
What week 43 of 2025 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 43 is one piece of that system.
In 2025, week 43 covers Oct 20 – Oct 26, 2025. That's October, deep in Q4. The same week number shifts by a day or two each year, so week 43 in 2026 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 43 of 2025
🇬🇧 United Kingdom
Daylight Saving Time — Fall Back
ObservanceWeek 43 across years
The same ISO week number lands on different dates each year. Here's how week 43 shifts.
Week 43 of 2025: questions and answers
What days are in week 43 of 2025?
Week 43 of 2025 runs from October 20, 2025 (Monday) through October 26, 2025 (Sunday). It spans October.
What month is week 43 in 2025?
Week 43 of 2025 falls entirely in October 2025.
How many working days are in week 43 of 2025?
Week 43 of 2025 has 5 working days.
What quarter is week 43 of 2025 in?
Week 43 of 2025 is in Q4 (2025). The week starts on day 293 of 365.
What is ISO week 43?
ISO week 43 is defined by the ISO 8601 international standard. It begins on Monday, October 20, 2025, and ends on Sunday, October 26, 2025. It is week 83% through the ISO year 2025.