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Key West — weather by month, water temperature
The air temperature by month
The average maximum daily temperature — 31.9°C in August. Average maximum night temperature — 27.7°C in July. The average minimum daily temperature — 22.9°C in January. The average minimum night temperature — 20.3°C in January.
The water temperature by month
Average maximum temperature of the water — 30.4°C fixed in August. The average minimum temperature of the water — 23°C fixed in January.
Maximum precipitation — 154.6 mm It was recorded in September. Minimum precipitation — 12.4 mm It was recorded in March.