When Does Summer Officially Start 2024. Edt (2051 gmt), and the summer solstice for the southern hemisphere occurs on dec. 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 summer solstice is nearly here, and we’re sharing all of the details about the first day of summer—take a look! The summer solstice for the northern hemisphere occurs on june 20, 2024, at 4:51 p.m.