Summer Solstice 2025 United States. The first day of summer (june solstice) is when the sun is in its most northern position directly over. It marks the longest day of the year and the arrival of.

The first day of summer, also known as the summer solstice, will occur on saturday, june 21, 2025, at 10:42 pm edt. The first day of summer arrives with the solstice this year on friday, june 20, 2025, 10:42 p.m.