First Day Of Summer 2024 Calendar 2024. — thursday, june 20 is the official first day of northern astronomical summer for 2024 — summer solstice — which is the longest day of the year for this half of the. — in 2024, the last day of summer in the northern hemisphere is september 22!
The first day of summer this year is thursday, june 20, 2024, per the almanac. September 23 (mon, 5 p.m.) preliminary study list deadline.
