The summer solstice in 2025 will occur on Friday, June 20, at 10:42 p.m. Eastern Time (ET). In the UK, it will be on Saturday, June 21, at 3:41 a.m. British Summer Time (BST). This event marks the longest day of the year in the Northern Hemisphere and the official start of summer, when the Earth's tilt is most inclined toward the Sun at the Tropic of Cancer (23.5° north latitude).
The summer solstice happens annually between June 20 and 22, and it represents the moment when the Sun reaches its northernmost point in the sky, resulting in the longest daylight period for that hemisphere.
