When Is Summer Solstice 2024 Longest Day. The summer solstice, which is when the sun reaches the most northerly point in the sky, is set to occur tonight at 21:50 bst/22:50 cest. The summer solstice, marking the year’s longest daylight period, officially occurs thursday at 4:51 p.m.
At the june solstice, the sun reaches its northernmost point. 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.
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