Summer Solstice 20254 2025. In 2025 the summer solstice will occur on saturday 21 june at 03.42 bst (02.42 gmt). The summer solstice usually occurs in late december, with last year's taking place on december 22.
When is summer solstice 2025? 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.