When Is The 1st Day Of Summer 2024. In the southern hemisphere, it will occur on december 21 at. The first day of summer this year is thursday, june 20, 2024, per the almanac.
It is also known as the summer solstice and it officially arrives at exactly 4:51 p.m. The first day of what’s projected to be an unusually hot summer, the longest day of the year and the summer solstice all arrive thursday, june 20.
