How Many Calendar Weeks Does 2025 Have 31 Days. The year 2025 has 52 calendar weeks. Weeks are according united states calendar rules, sunday first day and weeks are sunday to.

The first calendar week of 2025 starts on monday, december 30, 2024 and ends on sunday,. See the week numbers through the following calendars 2024 calendar, 2025 calendar and 2026.