Official 1st Day Of Summer 2024 Usa. The first day of summer in the northern hemisphere will be on june 20, 2024. Astronomical summer officially arrives in the northern hemisphere — amidst a heat wave — at 4:51 p.m.

Astronomical summer officially arrives in the northern hemisphere — amidst a heat wave — at 4:51 p.m. This year’s summer solstice will arrive this thursday on june 20 for the northern hemisphere, according to nasa.