What Day Is The Summer Solstice 2025 Calendar. The first day of summer, also known as the summer solstice, will occur on saturday, june 21, 2025, at 10:42 pm edt. Summer solstice 2025 (beginning of astronomical summer) on the day of the summer (june) solstice, the solar disk, moving along the ecliptic, will fall into its northernmost point and will be.
At the june solstice, the sun reaches its northernmost point. When is the first day of summer?