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

89.3

°F

July 2, 07:58

Trend:

increasing

Yesterday:

88.3°F

Tomorrow:

89.5°F

Sunrise:

06:42

Sunset:

20:20

Day Length:

13 h. 38 min.

Key West in July

Minimum:

70.4°F

Average:

74.0°F

Maximum:

76.4°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 89.3°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 3.0°F higher 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 rise a bit.

Recent sea temperature and forecast

Today's water temperature is notably higher than the average recorded over the past two weeks, indicating a significant warming trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 88.9°F on 2023, while the historical minimum was 83.7°F on 2021.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week suggests a gradual increase. The average temperature is expected to rise up to 89.8°F, with minimum temperature starting at 89.5°F, while the maximum might reach 90.0°F.

Daily water temperature in Key West

Date Current Year

actual* / forecast**

last year 10 years average
Jun 18 87.8°F 85.6°F 85.2°F
Jun 19 87.2°F 86.1°F 85.2°F
Jun 20 88.6°F 85.3°F 85.2°F
Jun 21 88.1°F 86.6°F 85.6°F
Jun 22 87.0°F 85.8°F 85.5°F
Jun 23 89.0°F 86.1°F 85.7°F
Jun 24 90.3°F 85.9°F 86.0°F
Jun 25 88.9°F 85.6°F 86.3°F
Jun 26 89.0°F 85.8°F 86.2°F
Jun 27 88.3°F 85.6°F 86.3°F
Jun 28 87.9°F 85.6°F 86.1°F
Jun 29 88.6°F 85.3°F 86.3°F
Jun 30 89.1°F 85.2°F 86.3°F
Jul 1 88.3°F 85.6°F 86.3°F
Jul 2 89.3°F 85.4°F 86.3°F
Jul 3 89.5°F 85.1°F 86.5°F
Jul 4 89.9°F 85.4°F 86.9°F
Jul 5 89.8°F 85.6°F 86.8°F
Jul 6 89.9°F 86.1°F 86.9°F
Jul 7 90.0°F 85.6°F 87.0°F
Jul 8 89.9°F 86.3°F 86.8°F
Jul 9 90.0°F 86.6°F 87.0°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 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, 86.5°F in Summer, and 82.9°F in Autumn.