First Day Of Summer 2025 In Usa. In the northern hemisphere, the next summer solstice will take place on june 20, 2024. The first day of summer is marked by the summer solstice , which corresponds to the astronomical beginning of summer.

Summer 2025 starts on friday, 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 reached its furthest tilt and begins to change directiion back. The summer solstice marks the official start of astronomical summer and the longest day of the year.