When Is Summer Solstice 2025. In 2025 the summer solstice will occur on saturday 21 june at 03.42 bst (02.42 gmt). The summer solstice is considered the first day of summer and the winter solstice is considered the first day of winter.
For the northern hemisphere, the summer solstice can take place. Savings time starts on march 9, 2025 and.