Summer Solstice 2025 Day And Night. In 2025 the summer solstice will occur on saturday 21 june at 03.42 bst (02.42 gmt). On the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial.

The longest day of 2025, also known as the summer solstice, is friday, june 20. In 2025, the summer solstice will occur on june 21, at 02:42 gmt in the northern hemisphere, and on december 21, 2024 at 09:20 gmt in the southern hemisphere.