Summer &Amp; Mer Solstice 2025 Date Uk. In 2025 the summer solstice falls on thursday 20 june, which is also the longest day of the year. Summer ends on the autumnal equinox, as the sun.
London the exact moment of the summer solstice in 2025 is 20 june, at 21:50:20. In 2025, summer solstice in the northern hemisphere will occur on thursday, june 20 around 4:50 p.m.