All data are in degrees Fahrenheit

en

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

76.1

°F

December 11, 16:11

Trend:

stable

Yesterday:

78.7°F

Tomorrow:

76.3°F

Sunrise:

07:01

Sunset:

17:40

Day Length:

10 h. 39 min.

Key West in December

Minimum:

68.5°F

Average:

73.0°F

Maximum:

75.6°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 76.1°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. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to rise 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 77.8°F on 2021, while the historical minimum was 72.4°F on 2024.

The water temperature over the last two weeks displayed soome variability. While the two week average stayed close to the historical average, there were some days when the temperature was close to the histoorical minimum and others when it was close to the historical maximum. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 76.1°F. Both minimum and maximum temperatures expected to be close to the average, offering a week of stable water conditions.

Daily water temperature in Key West

Date Current Year

actual* / forecast**

last year 10 years average
Nov 27 77.8°F 74.7°F 77.7°F
Nov 28 78.0°F 75.2°F 77.5°F
Nov 29 76.3°F 75.6°F 77.3°F
Nov 30 74.9°F 76.0°F 77.3°F
Dec 1 75.8°F 75.8°F 77.1°F
Dec 2 76.5°F 74.5°F 77.1°F
Dec 3 76.9°F 74.1°F 77.1°F
Dec 4 76.8°F 73.7°F 77.1°F
Dec 5 77.2°F 71.6°F 76.8°F
Dec 6 78.6°F 72.8°F 76.8°F
Dec 7 78.5°F 73.9°F 76.9°F
Dec 8 78.4°F 72.1°F 76.6°F
Dec 9 79.4°F 70.7°F 76.4°F
Dec 10 78.7°F 72.6°F 76.4°F
Dec 11 76.1°F 72.4°F 76.1°F
Dec 12 76.3°F 73.5°F 76.3°F
Dec 13 76.0°F 71.7°F 75.9°F
Dec 14 76.0°F 71.0°F 76.0°F
Dec 15 76.0°F 71.3°F 76.0°F
Dec 16 76.1°F 71.6°F 76.0°F
Dec 17 76.3°F 72.4°F 76.2°F
Dec 18 76.2°F 73.5°F 76.2°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.