When 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. According to the national weather service, the summer solstice will occur on thursday at 4:51 p.m.

Et, according to the national weather service. The sun will not set at the north pole, and at the south pole, it will.