First Day Of Summer 20254 2025 Dates. In the northern hemisphere, the next summer solstice will take place on june 21, 2025. The first day of summer, also known as the summer solstice, will occur on saturday, june 21, 2025, at 10:42 pm edt.
The word solstice comes from the. The summer solstice is the day with the most hours of sunlight during the whole year.