Autumnal Equinox 2024. The specific time, in the case of this year 8:43 a.m. In 2024 the autumn equinox occurs on 22 september at 12:44 utc (13:44 bst), marking the day when we experience roughly the same amount of daytime and nighttime.
In 2025 the autumnal equinox will occur on 22 september at 18.20 gmt (19.20 bst). In the northern hemisphere, these are known as the spring, or vernal, equinox and the fall, or autumnal, equinox.