What Is The First Day Of Summer 2024 Date. 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. Summer 2024 starts on thursday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth's axis having.
When is the 1st day of summer? That also happens to be the summer solstice, aka the start of summer.