Summer Solstice 2024 Date And Ti. But why does this happen, and what is the summer solstice? This date officially marks the start of summer in the northern hemisphere, occurring when.

This date officially marks the start of summer in the northern hemisphere, occurring when. 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.