Summer Solstice 2024 In 2024. Summer will officially arrive in the northern hemisphere on thursday (june 20) at 4:51 p.m. Here's everything you need to know about the northern hemisphere's longest day of the year.

Summer begins with the solstice on thursday, june 20, 2024, marking the astronomical first day of summer in the northern hemisphere. 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.