When Is Summer 2025 In Usa Start Date. Find out the date, how long in days until and count down to till summer 2025 with a countdown clock. Daylight saving time for 2025 will begin at 2 a.m.

Summer begins with the summer solstice, friday, june 20, 2025, 10:42 p.m. The first day of summer (june solstice) is when the sun is in its most northern position directly.