What Is The First Day Of Summer 2025 Calendar. This day is also known as the summer solstice. 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.

This year the summer will start on thursday june 20, 2024 (day of the summer solstice) and will end on sunday september 22, 2024 with the autumnal equinox. View the month calendar of july 2025 calendar including week numbers.