First Day Of Summer 2025

First Day Of Summer 2025. Fall begins with the autumnal equinox , monday, september 22, 2025, 2:19 p.m. Summer begins with the solstice on friday, june 20, 2025, marking the astronomical first day of summer in the northern hemisphere.

Is the june solstice the first day of summer? Summer starts at the moment when the sun is farthest north: