Summer And Winter Solstice 2024 Usa. Summer begins with the summer solstice, sunday, june 21, 2026, 4:24 a.m. It marks the northern hemisphere’s shortest day (first day of winter) and southern hemisphere’s longest day.

In 2024, summer solstice in the northern hemisphere will occur on thursday, june 20 around 4:50 p.m. The summer solstice signals the beginning of astronomical summer and the winter solstice signals the beginning of winter.