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

77.7

°F

November 5, 17:47

Trend:

decreasing

Yesterday:

77.7°F

Tomorrow:

77.4°F

Sunrise:

06:36

Sunset:

17:45

Day Length:

11 h. 9 min.

Key West in November

Minimum:

68.5°F

Average:

73.2°F

Maximum:

76.2°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 77.7°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 2.7°F lower than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. 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 is also close to the historical minimum temperature for this date. The maximum temperature recorded for this date was 83.6°F on 2019, while the historical minimum was 78.4°F on 2017.

Observations from the last two weeks indicate that the water temperature was in proximity to the lowest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 77.1°F, the minimum temperature may reach 76.9°F, and the maximum might stay at 77.4°F.

Daily water temperature in Key West

Date Current Year

actual* / forecast**

last year 10 years average
Oct 22 81.8°F 82.8°F 82.1°F
Oct 23 80.6°F 82.9°F 81.8°F
Oct 24 80.2°F 82.7°F 81.7°F
Oct 25 81.1°F 82.3°F 81.6°F
Oct 26 79.6°F 81.4°F 81.5°F
Oct 27 78.6°F 82.1°F 81.3°F
Oct 28 78.9°F 82.9°F 81.6°F
Oct 29 79.0°F 83.2°F 81.7°F
Oct 30 78.7°F 82.2°F 81.3°F
Oct 31 78.6°F 82.5°F 81.3°F
Nov 1 78.6°F 81.2°F 81.2°F
Nov 2 78.1°F 79.8°F 80.8°F
Nov 3 77.8°F 79.4°F 80.5°F
Nov 4 77.7°F 78.7°F 80.4°F
Nov 5 77.7°F 79.7°F 80.4°F
Nov 6 77.4°F 79.1°F 80.0°F
Nov 7 77.2°F 79.9°F 79.9°F
Nov 8 77.0°F 79.6°F 79.7°F
Nov 9 77.0°F 80.4°F 79.7°F
Nov 10 76.9°F 80.7°F 79.6°F
Nov 11 77.0°F 80.9°F 79.7°F
Nov 12 77.2°F 80.6°F 79.8°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 332 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 February 7, 2026, dipping to 64.1°F. The average readings by season are 74.0°F in Winter, 79.1°F in Spring, 86.6°F in Summer, and 82.9°F in Autumn.