Autumn Equinox 2025 Uk Events. In 2025 the autumnal equinox will occur on 22 september at 7.20 pm bst. The occurrence of spring equinox usually falls on the 20th or 21st march, and the autumnal equinox falls on 22nd or 23rd september every year.
Find out more about equinoxes and solstices In 2025 the autumnal equinox will occur on 22 september at 18.20 gmt (19.20 bst).