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

March 21, 18:10

Trend:

decreasing

Yesterday:

75.4°F

Tomorrow:

73.3°F

Sunrise:

07:30

Sunset:

19:39

Day Length:

12 h. 9 min.

Key West in March

Minimum:

71.7°F

Average:

75.2°F

Maximum:

78.9°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 2.5°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 79.8°F on 2022, while the historical minimum was 73.1°F on 2017.

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 maximum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 73.5°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
Mar 7 76.2°F 74.1°F 76.0°F
Mar 8 76.8°F 73.0°F 75.7°F
Mar 9 77.5°F 73.2°F 75.7°F
Mar 10 78.7°F 74.4°F 75.5°F
Mar 11 79.3°F 75.1°F 75.8°F
Mar 12 79.5°F 73.5°F 76.0°F
Mar 13 78.6°F 72.8°F 75.9°F
Mar 14 78.0°F 74.3°F 76.3°F
Mar 15 77.5°F 75.3°F 76.3°F
Mar 16 78.0°F 76.6°F 76.4°F
Mar 17 79.4°F 77.2°F 76.9°F
Mar 18 78.3°F 76.1°F 76.6°F
Mar 19 77.5°F 74.4°F 76.8°F
Mar 20 75.4°F 73.3°F 76.6°F
Mar 21 73.8°F 73.6°F 76.3°F
Mar 22 73.3°F 72.5°F 75.9°F
Mar 23 72.9°F 72.4°F 75.4°F
Mar 24 73.1°F 74.6°F 75.7°F
Mar 25 73.4°F 74.6°F 75.9°F
Mar 26 73.6°F 74.9°F 76.1°F
Mar 27 74.2°F 76.1°F 76.7°F
Mar 28 74.4°F 76.1°F 76.9°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, 86.4°F in Summer, and 82.9°F in Autumn.