When did fall get here?

I know fall is here because I have a cold and cannot find a long sleeve shirt in my wardrobe of tank tops. I have one pair of closed toe shoes - the rest are sandals. Where were the tv commercials telling me that I had to go out and buy shoes, pants and sweaters. I've been living in warm areas from February till now and have adjusted to it never getting cold. I feel like I need to migrate south....or into a bottle of cough syrup...