When Does Summer Start 2025 Usa Calendar. Fall begins with the autumnal equinox, saturday, september 22, 2029, 1:38 p.m. 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.
A s 2025 gets started, planning for the year is in full swing. 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.