Sunset Autumn Equinox 2025 Date And Time. The first day of autumn is in 2025 on september 22 (according to the astronomical definition). It’s bringing summer to the southern hemisphere and winter to the northern hemisphere.

This page provides date and time for autumnal equinox in the year 2025 for boydton, virginia, united states. On the day of the winter (december) solstice, the sun passes through the southernmost point of.