Summer Solstice 2024 Longest Day In Usa. Edt (2051 gmt), and the summer solstice for the southern hemisphere occurs on dec. In this case, it’s the official start to the astronomical summer, which in the northern hemisphere occurs this year on thursday, june 20, at 3:50 p.m.

Edt on june 20, according to timeanddate.com. Find the answers to common questions, like: