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

79.7

°F

November 5, 23:52

Trend:

stable

Yesterday:

78.7°F

Tomorrow:

79.4°F

Sunrise:

06:36

Sunset:

17:45

Day Length:

11 h. 9 min.

Key West in November

Minimum:

68.5°F

Average:

73.1°F

Maximum:

76.2°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 79.7°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 0.9°F lower than the average recorded on this particular day in recent years. Since yesterday, there was a noticeable 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

Today's water temperature is considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. 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 83.6°F on 2019, while the historical minimum was 78.4°F on 2017.

Over the last two weeks, the water temperature has stayed slightly above than historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 79.0°F, the minimum temperature may reach 78.8°F, and the maximum might stay at 79.4°F.

Daily water temperature in Key West

Date Current Year

actual* / forecast**

last year 10 years average
Oct 22 82.8°F 80.5°F 82.0°F
Oct 23 82.9°F 80.3°F 81.9°F
Oct 24 82.7°F 80.0°F 81.8°F
Oct 25 82.3°F 80.3°F 81.6°F
Oct 26 81.4°F 81.0°F 81.6°F
Oct 27 82.1°F 80.8°F 81.5°F
Oct 28 82.9°F 80.8°F 81.5°F
Oct 29 83.2°F 80.5°F 81.6°F
Oct 30 82.2°F 79.8°F 81.3°F
Oct 31 82.5°F 79.3°F 81.4°F
Nov 1 81.2°F 79.5°F 81.3°F
Nov 2 79.8°F 79.7°F 80.9°F
Nov 3 79.4°F 79.2°F 80.7°F
Nov 4 78.7°F 79.4°F 80.6°F
Nov 5 79.7°F 79.4°F 80.6°F
Nov 6 79.4°F 79.3°F 80.3°F
Nov 7 79.1°F 79.6°F 80.0°F
Nov 8 79.0°F 79.6°F 79.9°F
Nov 9 78.9°F 79.5°F 79.8°F
Nov 10 78.8°F 79.4°F 79.8°F
Nov 11 78.9°F 79.5°F 79.8°F
Nov 12 79.1°F 79.7°F 80.0°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 83.0°F in Autumn.