When Does Summer Start 2025 Usa 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. Daylight saving time is set to begin on sunday, march 9, 2025.

Each season lasts approximately 3 months and corresponds to a period of the year which has a relative constancy in terms of temperature and climate. Summer begins with the summer solstice, friday, june 20, 2025, 10:42 p.m.