When Is Summer 2024 Start. The 2024 summer solstice arrives june 20 at 4:51 p.m. The first day of summer (june solstice) is when the sun is in its most northern position directly over the tropic of cancer.

March 19, 2024 (vernal equinox) summer: The first day of summer is also known as the summer solstice, and in 2024 it happens on thursday, june 20 at 4:51 p.m.