By cool he means cold - it's best to wear layers in SF because you'll be adding / removing them throughout the day depending on where you're at. The Mission is

By cool he means cold - it's best to wear layers in SF because you'll be adding / removing them throughout the day depending on where you're at. The Mission is hot and Outer Sunset is freezing. Spring, Summer, and winter are cold, fall is warm. But yeah, SF is also cool...