Number Of Weekdays In 2025 Calendar. The first calendar week of 2025 starts on monday, december 30, 2024 and ends on sunday, january 5, 2025. There are 7 months with 31 days, 4 months with 30 days, and 1 month with 28 days in 2025, or 52 weeks and 1 day in 2025 when counting by weeks.

There are 52 weeks in 2025. 2025 and ends wednesday, december 31st.