All data are in degrees Fahrenheit

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Water temperature in Key West

Detailed information about the current water temperature in Key West. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Key West now

74.7

°F

December 30, 21:59

Trend:

increasing

Yesterday:

74.1°F

Tomorrow:

74.8°F

Sunrise:

07:11

Sunset:

17:49

Day Length:

10 h. 38 min.

Key West in January

Minimum:

69.2°F

Average:

75.0°F

Maximum:

78.1°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 74.7°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is about the same as the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to rise a bit.

Recent sea temperature and forecast

Today's reading indicates a minor change compared to the average water temperature of the last two weeks, but the overall trend remains steady. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 78.1°F on 2015, while the historical minimum was 70.4°F on 2020.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 75.0°F, with minimum temperature starting at 74.7°F, while the maximum might reach 75.5°F.

Daily water temperature in Key West

Date Current Year

actual* / forecast**

last year 10 years average
Jan 1 75.0°F 75.5°F 75.0°F
Jan 2 75.0°F 75.2°F 75.1°F
Jan 3 75.5°F 75.6°F 75.5°F
Jan 4 75.4°F 73.7°F 75.5°F
Jan 5 74.9°F 73.1°F 74.9°F
Jan 6 74.7°F 73.0°F 74.7°F
Dec 16 75.2°F 71.6°F 76.0°F
Dec 17 74.2°F 72.4°F 76.1°F
Dec 18 74.2°F 73.5°F 76.0°F
Dec 19 74.5°F 74.2°F 76.0°F
Dec 20 76.0°F 73.5°F 75.8°F
Dec 21 75.6°F 72.8°F 75.2°F
Dec 22 75.9°F 72.1°F 75.2°F
Dec 23 75.1°F 71.0°F 74.8°F
Dec 24 75.2°F 70.9°F 74.5°F
Dec 25 74.3°F 70.3°F 74.4°F
Dec 26 73.7°F 71.0°F 74.1°F
Dec 27 73.7°F 71.8°F 74.4°F
Dec 28 74.0°F 72.5°F 74.4°F
Dec 29 74.1°F 73.2°F 74.3°F
Dec 30 74.7°F 73.4°F 74.7°F
Dec 31 74.8°F 74.3°F 74.8°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Key West by month

In Key West, almost every month besides January is comfortable for swimming. Which amounts to 333 swimming days.
The warmest water in Key West was recorded on August 12, 2023, reaching a 91.4°F. While the coldest temperature occurred on January 26, 2025, dipping to 66.0°F. The average readings by season are 74.2°F in Winter, 79.1°F in Spring, 86.4°F in Summer, and 82.9°F in Autumn.