When Does Autumn Begin 2024 Uk. Autumn / fall equinox 2024. The autumnal equinox occurs in september each year, and in the northern hemisphere the date marks the end of summer and beginning of autumn.

In 2024, these are the astronomical dates and times for the start of each season: From this point on, daylight in the northern hemisphere will gradually grow shorter until the winter solstice, which occurs on dec.