Autumn Equinox 2025 Date Uk. Find london march and september equinox, june and december. In 2025 the autumnal equinox will occur on 22 september at 7.20 pm bst.
In 2025 the autumnal equinox will occur on 22 september at 18.20 gmt (19.20 bst). The starting date for each season changes by a day or so each year.