Summer Time Start 2025. In 2025, the summer solstice will occur on june 21, at 02:42 gmt in the northern hemisphere, and on december 21, at 15:03 gmt in the southern hemisphere. When in 2025 is summer?
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. However, meteorologists are also interested in the beginning of the meteorological summer.