What Is The First Day Of Summer 2024 Calendar. 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, the first day of summer, also known as the summer solstice, is thursday, june 20.
* the dates of summer given. Astronomers consider this the beginning of the summer in the northern hemisphere, nasa said.