When Is The Autumn Equinox 2024 Uk. Once the autumn equinox passes, the uk will see much darker nights, so it's essential to make the most. The autumn season is defined by three months:
The autumn equinox marks the start of the season, meaning it’ll take place on september 22 this year. The autumnal equinox, or the first day of fall in the northern hemisphere takes place every year on september 22nd or september 23rd.