What Is The Last Day Of Summer 2024 In Usa. * the dates of the seasons. The first official day of summer astronomically for 2024 is thursday, june 20, which is when the northern hemisphere has the longest day of the year, according.

When do the four seasons start in 2024—for spring, summer, fall, and winter? In 2024, the solstice moment will fall at 20:51 utc (3:51 p.m.