When Does Autumn Begin 2024. The first day of fall in the northern hemisphere is sunday, sept. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.
According to the meteorological calendar, the first autumn day is friday 1st september 2024. Sets out what’s been announced so far and the tax changes that could be confirmed in the autumn budget later this year.