First Day Of Spring And Summer 2024. The first day of summer this year is thursday, june 20, 2024, per the almanac. Usually, when we talk about the first day of summer, we are referring to the astronomical summer which is defined by the earth's axis and orbit around the sun.

T his year, the summer solstice falls on thursday, june 20 at 4:50 p.m. The first day of summer in the northern hemisphere will be on june 20, 2024.