Autumn Equinox Uk 2025. In some regions, the landscape totally changes during autumn, with greenery being replaced by bright reds and oranges. The autumn equinox falls on sunday, september 22 in 2025.
According to the meteorological calendar, the first autumn day is sunday 1st september 2025. The autumn equinox is the moment when the sun passes the earth’s equator and for one nanosecond the earth is neither tilted toward nor away from the sun.