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

73.8

°F

January 8, 06:06

Trend:

stable

Yesterday:

73.4°F

Tomorrow:

73.5°F

Sunrise:

07:13

Sunset:

17:55

Day Length:

10 h. 42 min.

Key West in January

Minimum:

69.2°F

Average:

74.8°F

Maximum:

78.1°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 73.8°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.4°F lower than 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 fall a bit.

Recent sea temperature and forecast

The water temperature today is above average for the last two weeks, showing a small increase in temperature. 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 76.9°F on 2017, while the historical minimum was 71.5°F on 2021.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 72.8°F, the minimum temperature may reach 72.5°F, and the maximum might stay at 73.5°F.

Daily water temperature in Key West

Date Current Year

actual* / forecast**

last year 10 years average
Jan 1 73.0°F 75.5°F 74.8°F
Jan 2 72.3°F 75.2°F 74.9°F
Jan 3 71.7°F 75.6°F 75.2°F
Jan 4 72.2°F 73.7°F 75.2°F
Jan 5 72.7°F 73.1°F 74.7°F
Jan 6 73.7°F 73.0°F 74.5°F
Jan 7 73.4°F 71.7°F 74.0°F
Jan 8 73.8°F 72.1°F 74.2°F
Jan 9 73.5°F 71.4°F 73.9°F
Jan 10 73.1°F 69.4°F 73.5°F
Jan 11 72.7°F 68.5°F 73.1°F
Jan 12 72.6°F 68.5°F 73.0°F
Jan 13 72.7°F 67.7°F 73.1°F
Jan 14 72.8°F 69.0°F 73.2°F
Jan 15 72.5°F 69.5°F 72.9°F
Dec 25 74.3°F 70.3°F 74.1°F
Dec 26 73.7°F 71.0°F 73.8°F
Dec 27 73.7°F 71.8°F 74.1°F
Dec 28 74.0°F 72.5°F 74.1°F
Dec 29 74.1°F 73.2°F 73.9°F
Dec 30 74.7°F 73.4°F 74.3°F
Dec 31 74.5°F 74.3°F 74.5°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 334 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.