When Is The First Day Of Autumn 2024. In the northern hemisphere, the fall months are from the end of september, through october and. One hundred and eighty days later, when the southern hemisphere is tilted toward the sun, it is called the winter solstice.

Pacific daylight time) autumn begins astronomically in the northern. The first day of fall is sunday, september 22, 2024—the same day as the autumn equinox—in the northern hemisphere.