Calendar Summer 2025. 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. 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.

Fifa club world cup 2025: 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.