First And Last Day Of Summer 2024. The first day of what's projected to be an unusually hot summer, the longest day of the year and the summer solstice all arrive thursday, june 20. In the northern hemisphere, the next summer solstice will take place on june 20, 2024.

That’s the date of this year’s summer solstice. 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.