When Does Summer Start 2025 Date. When do the four seasons start in 2025—for spring, summer, fall, and winter? This year the summer will start on thursday june 20, 2025 (day of the summer solstice) and will end on sunday september 22, 2025 with the autumnal equinox.

What time does summer start 2025. Summer of 2025 was 2.25 f (1.25 c) warmer than the average summer between 1951 and 1980, and august alone was 2.34 f (1.3 c) warmer than.