First Day Of Autumn 2024 Uk. The first day of spring in the uk astronomically occurs on the vernal equinox, 20 march 2025. On september 22, 2024, the northern hemisphere will greet autumn with open arms.
According to the meteorological calendar, the first autumn day is friday 1st september 2024. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.