what season does september fall in
However, the equinox marks  the changes of seasons and September 22nd or 23rd is the normal  date for the equinox. Therefore, prior to the equinox, September is  technically summer in the northern hemisphere and changes to fall  at the equinox. Conversely, in the southern hemisphere, prior to  the equinox, September is considered winter and changes to spring  at the equinox. 2 people found this useful.