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In 2015, fall begins on September 23rd (at 08:20 UTC) for countries in the Northern Hemisphere (United States, Canada). Fall-Autumn Activities and Games. In 2015, fall begins on March 20th (22:45 UTC) for countries in the Southern Hemisphere (parts of South America, parts of Africa, Australia, and Antarctica).
Autumn: When the Leaves Fall. Autumn begins with the autumnal equinox (September 22, most years). The equinox is the point at which the sun is directly over the equator. From this point throughout the season, the pole is beginning to point away from the sun. The hemisphere is getting more night hours than daylight and this has a cooling effect.