First Day Of Summer 2025 Calendar Dates And Times. Find out the date when summer is in 2025 and count down the days until summer with a countdown timer. 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.

In the northern hemisphere, the next summer solstice will take place on june 21, 2025. Find out the date when summer is in 2025 and count down the days until summer with a countdown timer.