First Day Of Summer 2024 Usage. The first day of summer this year is thursday, june 20, 2024, per the almanac. This day is also known as the summer solstice.

This year’s summer solstice will arrive this thursday on june 20 for the northern hemisphere, according to nasa. 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 planet.