First Day Of Autumn 2025 Uk Dates. The autumn equinox falls on saturday 23 september this year and marks the day when day and night are roughly equal length. The first day of fall in 2025 arrives with the fall equinox on sunday, september 22, 2025, at 8:44 a.m.
The first day of autumn all depends on what calendar you follow. They occur between the summer and winter solstices.
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