Autumn Equinox Date 2024 Usa. In 2024 the autumnal equinox will occur on 22 september at 12.44pm gmt (1.44pm bst). Autumn equinox 2024 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator,.
The first day of winter in the northern hemisphere is marked by the winter solstice, which is expected to arrive at 3:19 a.m. When is the autumnal equinox in 2024?