Autumn 2024 Date. In 2024, the last day of summer in the northern hemisphere is september 22! According to the astronomical autumn, the autumn equinox will signal the start of the season and begin on the 22nd of september 2024.

The september equinox will fall at 12:44 utc (7:44 a.m. This year the autumn will start on sunday september 22, 2024 (day of the fall equinox) and will end on saturday december 21, 2024 with the winter solstice.