What Day Is The Autumn Equinox In 2024 Uk. There are three main different ways of defining autumn: The equinox in the northern hemisphere occurs twice a year around 20 march (the spring equinox) and around 22 september (the autumn equinox).
Time for warm jumpers, hot drinks, cosy fires and changing leaves. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.