When Was The First Day Of Summer 2024. The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m. 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.

Is the summer solstice the first day of summer? Astronomers consider this the beginning of the summer in the northern hemisphere, nasa said.