How many weeks are in a month?

Q: How many weeks are in a month?

Between 4 and 4.43 weeks: February has exactly 4 weeks (4.14 in a leap year), 30-day months have 4.29 weeks, 31-day months 4.43. The average is 4.35 weeks (52.14 ÷ 12).

4.35 weeks on average — every month is 4 weeks plus 0 to 3 days. Only February (in a common year) is exactly 4 weeks.

Every month of 2026

Month	Days	Weeks (exact)	Weeks + days	Weekdays	ISO weeks touched
January	31	4.43	4 weeks + 3 days	22	1–5
February	28	4.00	4 weeks + 0 days	20	5–9
March	31	4.43	4 weeks + 3 days	22	9–14
April	30	4.29	4 weeks + 2 days	22	14–18
May	31	4.43	4 weeks + 3 days	21	18–22
June	30	4.29	4 weeks + 2 days	22	23–27
July	31	4.43	4 weeks + 3 days	23	27–31
August	31	4.43	4 weeks + 3 days	21	31–36
September	30	4.29	4 weeks + 2 days	22	36–40
October	31	4.43	4 weeks + 3 days	22	40–44
November	30	4.29	4 weeks + 2 days	21	44–49
December	31	4.43	4 weeks + 3 days	23	49–53

Method

Weeks = days in the month ÷ 7. The average 4.35 is 365.25 ÷ 7 ÷ 12. Weekdays are Monday–Friday counted by date. "ISO weeks touched" is the first and last ISO week number that has at least one day in the month.