When Is The Autumn Equinox 2025 Uk. Mabon, celebrated around the time of the autumn equinox, typically between september 21st and 24th, marks a period of balance and reflection. At the summer solstice, we have the longest day and the shortest night of the year.

The 2025 autumnal equinox will occur on september 22, 2025, at 14:21 utc (coordinated universal time). In 2025 the autumnal equinox will occur on 22 september at 7.20 pm bst.