Last Day Of Summer 2024 Usage. 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. The summer solstice happens on thursday, june 20, 2024!
When is first day of summer in 2024 is thursday, june 20, and it lasts until sunday, september 22, inclusive. * the dates of summer given on this page are for the.