Why is September the hottest month in San Francisco?
In: 6
San Francisco’s position, on a peninsula with mountains to every side, makes the weather primarily influenced by the ocean and, critically, *wind*.
The summer months see an interesting phenomenon, where interior portions of the bay warm up, which causes constant winds inland, which brings in cold, damp air from the ocean. In September, there’s a period where the inland areas are cooler than the ocean surface, which causes “warm”, dry air to blow over San Francisco from the east.
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