First Day Of Summer 2025 Usa. 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. Summer 2025 starts on sunday and ends on sunday.
Click on the date that interests you to see the lighting map of the earth on that date and time (beginning of the season). Need to know the exact date of of the first day of summer this year?