What Is The 1st Day Of Summer 2024 Usa. When do the four seasons start in 2024—for spring, summer, fall, and winter? Learn when it happens in 2024 for both hemispheres, what causes it and how it is celebrated around.

The summer solstice occurs on thursday, june 20, 2024, at 4:51 p.m. Learn about the summer solstice, the event that marks the beginning of the longest day of the year and the summer season in the northern hemisphere.