First Day Of Summer 2025 Usa Time. The first day of summer (june solstice) is when the sun is in its most northern position directly over the tropic of cancer. Find out the date when summer is in 2025 and count down the days until summer with a countdown timer.

In the northern hemisphere, the next summer solstice will take place on june 21, 2025. Daylight saving time starts on the second sunday of march for the united states.