First Day Of Summer 20204 2024. Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere. The first day of summer in the northern hemisphere will be on june 20, 2024.

What exactly is the summer solstice? The first day of summer is also known as the summer solstice, and in 2024 it happens on thursday, june 20 at 4:51 p.m.