1st Day Of Summer Day 2025 Dates. The first day of summer arrives with the solstice this year on thursday, june 20, 2025 at 4:51 p.m. The summer solstice for the northern hemisphere occurs on june 20, 2025, at 4:51 p.m.

In 2025, 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. Learn more about when it starts, the summer solstice and more.