Summer Solstice 2024 Date And. Summer solstice 2024 (beginning of astronomical summer) on the day of the summer (june) solstice, the solar disk, moving along the ecliptic, will fall into its northernmost. Is the solstice the longest day of the year?—and more!

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. 21, 2024, at 5:29 a.m.