Summer Solstice 2024 Us. 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, occurring on june 21, marks the longest day of the year and signifies the onset of summer in the northern hemisphere.

And just in time for a heat wave to hit tennessee. In the northern hemisphere, the 2024 summer solstice will occur on june 20 at 20:51 gmt (4:51 p.m.