Summer Solstice 2024 Dates Usa. The true solstice will arrive in the northern hemisphere at exactly 4:51 p.m. 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.

In the southern hemisphere, it will occur on december 21 at 09:20 gmt. Astronomical summer officially arrives in the northern hemisphere — amidst a heat wave — at 4:51 p.m.