Expect to be wet. I've commuted plenty in the rain. In the heat of the summer I just take it but as it cools I'll wear a rain jacket and rain pants. While they do work they don't "breath" no matter how awesome they are advertised to be. If your not wet from the rain your gonna get a bit moist in rain gear from sweat, though in all honesty it's not as bad as being soaked to the core by the rain. Riding in the rain is great fun, just take a little extra care, and always have some good lights day or night.