Summer Solstice 2024 Time Est. Summer officially begins in the northern hemisphere today 20 june, marking the longest day of the year. In 2024, the summer solstice will occur on june 20, at 20:51 gmt in the northern hemisphere, and on december 21, at 09:20 gmt in the southern 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. 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.
