First Day Of Summer 2025 Calendar. How many days until summer 2025? 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.

In the northern hemisphere, the next summer solstice will take place on june 21, 2025. Next summer will be on june 1, 2025.