Summer 2024 Date Usa. 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. 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.
Online calendar of holidays and days off in united states for the summer of 2024. When does summer end in 2024?