First Day Of Summer 2025 Canada Usa. In 2025, the summer solstice in the northern hemisphere will occur on june 20, 2025, at 10:42 pm edt (or 2:42 am utc on june 21). The first day of summer arrives with the solstice this year on friday, june 20, 2025, 10:42 p.m.
The summer solstice is the first day of astronomical summer, although the more logical metrological summer begins december 1st / june 1st (depending on hemisphere). In the northern hemisphere, it always occurs around june 20 or 21.
