First Day Of Summer 2024 Usa Calendar. This year the summer will start on thursday june 20, 2024 (day of the summer solstice) and will end on sunday september 22, 2024 with the autumnal equinox. This is the longest day of the year and marks the start of summer in the northern hemisphere.

In the northern hemisphere this year, the first day of summer is thursday, june 20, 2024. In 2024, summer solstice in the northern hemisphere will occur on thursday, june 20 around 4:50 p.m.