Yeah, but that's especially in the summer months. Come September/October the Central Valley starts to cool down, which stops the hot-air-rising midday "pump" that pulls damp air in off the Pacific across the cold Humboldt Current making all that afternoon fog. So Sep/Oct is when San Francisco gets its best weather, before the shorter Fall days and the on-coming rainy season make for cooler weather overall by November. You've picked the best time to see SF.Still, a heat wave in the Valley can still pull in the fog now and then, so do bring a fleece jacket just in case.




Still, a heat wave in the Valley can still pull in the fog now and then, so do bring a fleece jacket just in case.

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