Autumn Equinox 2024 Dates Uk. Sunday, sep 22 8:43 am edt. Normally, the autumn equinox falls between 22 and 24 september, and this year the equinox occurs on 22 september at 13:44 bst.
The autumn equinox marks the start of the season, meaning it’ll take place on september 22 this year. The first day of autumn often called fall (september.