What Is The First Day Of Summer 2024 Solstice. When is the first day of summer 2024? The true solstice will arrive in the northern hemisphere at exactly 4:51.

In 2024, the summer solstice will occur on june 20, at 20:51 gmt in the northern hemisphere, and on december 21, at 09:20 gmt in the southern hemisphere. The 2024 summer solstice arrives june 20 at 4:51 p.m.