What Date Is Summer Solstice 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 planet. It’ll be the longest day of the year north of the equator, and it is the.

Here’s how to see it. The date for the summer solstice varies between june 20 and june 22, depending on the year.