When Was The First Day Of Summer 2024 In. 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. This year's summer solstice will arrive this thursday on june 20 for the northern hemisphere, according to nasa.

(in the southern hemisphere, it is around december 21 or 22.) this date is considered to be the first. The first day of summer this year is.