Average monthly water temperature in Key West, the United States of America

On this page you find the mean water temperature over the year in Key West (Florida), the United States of America. Discover when the water is at its warmest and coolest, perfect for planning your visit.

Key West offers consistently warm water temperatures year-round. The warmest month, August, averages 31°C (88°F).

Even in the coolest water temperature month, January, the average temperature is 22°C (72°F). These conditions are perfect for water activities and relaxation throughout the year.

Key West (FL) 3-Day Forecast

10-Day Forecast

More climate data for Key West

Temperature Rainfall Sunshine Humidity Water Temp

See the full Key West climate overview or explore weather in the United States of America.

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