What is the current water temperature in Key West?

As of now, in Key West, the water temperature is 24.61°F. It's safe to say that the water is comfortably warm for various water-related activities.

United States > Key West

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.

76.3

°F

April 18, 00:27

Trend:

increasing

Yesterday:

76.2°F

Tomorrow:

76.3°F

Sunrise:

07:03

Sunset:

19:51

Day Length:

12 h. 48 min.

Key West in April

Minimum:

72.1°F

Average:

75.5°F

Maximum:

78.3°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 76.3°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 3.0°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 stay about the same.

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 82.9°F on 2020, while the historical minimum was 76.5°F on 2017.

latest data

last year

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 minimum recorded over the past years. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 76.5°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
Apr 4	80.1°F	78.0°F	78.5°F
Apr 5	79.5°F	77.5°F	78.6°F
Apr 6	78.4°F	77.0°F	78.1°F
Apr 7	78.8°F	76.3°F	78.3°F
Apr 8	79.9°F	76.3°F	78.5°F
Apr 9	78.9°F	76.4°F	78.5°F
Apr 10	77.6°F	76.1°F	78.5°F
Apr 11	77.0°F	76.1°F	78.2°F
Apr 12	76.7°F	76.2°F	78.2°F
Apr 13	76.4°F	76.6°F	78.3°F
Apr 14	75.5°F	76.7°F	78.3°F
Apr 15	75.9°F	76.4°F	78.4°F
Apr 16	76.4°F	76.6°F	78.8°F
Apr 17	76.2°F	77.0°F	79.2°F
Apr 18	76.3°F	77.3°F	79.3°F
Apr 19	76.3°F	77.5°F	79.3°F
Apr 20	76.4°F	78.2°F	79.4°F
Apr 21	76.4°F	79.5°F	79.4°F
Apr 22	76.4°F	80.0°F	79.3°F
Apr 23	76.4°F	79.7°F	79.3°F
Apr 24	76.8°F	79.5°F	79.8°F
Apr 25	76.9°F	79.3°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 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.