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San Francisco — weather by month, water temperature
The air temperature by month
The average maximum daily temperature — 18.9°C in September. Average maximum night temperature — 13.6°C in October. The average minimum daily temperature — 12.5°C December. The average minimum night temperature — 9.6°C in January.
The water temperature by month
Average maximum temperature of the water — 15.7°C fixed in September. The average minimum temperature of the water — 11.2°C fixed in January.
Maximum precipitation — 69.4 mm It was recorded in January. Minimum precipitation — 3.2 mm It was recorded in September.