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

85.6

°F

June 18, 23:14

Trend:

stable

Yesterday:

86.0°F

Tomorrow:

85.6°F

Sunrise:

06:38

Sunset:

20:18

Day Length:

13 h. 40 min.

Key West in June

Minimum:

70.8°F

Average:

74.7°F

Maximum:

76.8°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 85.6°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 0.8°F higher 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 stay about the same.

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 87.7°F on 2023, while the historical minimum was 83.7°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 suggests a gradual increase. The average temperature is expected to rise up to 86.1°F, with minimum temperature starting at 85.6°F, while the maximum might reach 86.9°F.

Daily water temperature in Key West

Date Current Year

actual* / forecast**

last year 10 years average
Jun 4 85.0°F 86.0°F 84.3°F
Jun 5 84.5°F 85.7°F 84.1°F
Jun 6 83.6°F 86.8°F 84.2°F
Jun 7 84.8°F 87.1°F 84.3°F
Jun 8 83.8°F 87.0°F 84.3°F
Jun 9 85.4°F 86.7°F 84.4°F
Jun 10 85.9°F 87.9°F 84.7°F
Jun 11 85.4°F 87.0°F 84.6°F
Jun 12 85.6°F 86.7°F 84.7°F
Jun 13 85.2°F 86.3°F 84.8°F
Jun 14 85.3°F 85.0°F 84.8°F
Jun 15 86.3°F 85.2°F 85.1°F
Jun 16 86.5°F 84.7°F 85.1°F
Jun 17 86.0°F 84.6°F 85.0°F
Jun 18 85.6°F 84.3°F 84.8°F
Jun 19 85.6°F 84.0°F 84.8°F
Jun 20 85.7°F 84.2°F 84.8°F
Jun 21 86.0°F 84.3°F 85.1°F
Jun 22 86.1°F 84.6°F 85.2°F
Jun 23 86.1°F 84.1°F 85.3°F
Jun 24 86.3°F 84.6°F 85.5°F
Jun 25 86.9°F 85.7°F 86.0°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 82.9°F in Autumn.