Summer And Winter Solstice 2024 Calendar. When is the first day of summer in 2024? In 2024, it will happen on june 20, at 20:51 gmt.
Fall begins with the autumnal equinox, sunday, september 22, 2024, 8:44 a.m. The june solstice marks the first day of astronomical summer in the northern hemisphere and the first day of winter in the southern hemisphere.
