When Is Summer 2025 Start Date. The same is true for summer vacations in 2025. 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.
These are guidelines only for 2025 which may vary from school to school. Meanwhile the summer solstice will take place on june 20, 2025.