What is the current water temperature in Key West?

As of now, in Key West, the water temperature is 23.46°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.

74.2

°F

January 15, 14:45

Trend:

stable

Yesterday:

73.8°F

Tomorrow:

74.0°F

Sunrise:

07:13

Sunset:

18:00

Day Length:

10 h. 47 min.

Key West in January

Minimum:

69.2°F

Average:

74.8°F

Maximum:

78.1°F

Sea water temperature in Key West today

As of now, in Key West, the water temperature is 74.2°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.3°F higher than the average recorded on this particular day in recent years. Since yesterday, there was a slight increase in temperature. This indicates a warming trend over the past day. According to the forecast, we expect the temperature to fall a bit.

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 75.7°F on 2020, while the historical minimum was 69.5°F on 2025.

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 histoorical minimum and others when it was close to the historical maximum. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 73.8°F, the minimum temperature may reach 73.5°F, and the maximum might stay at 74.1°F.

Daily water temperature in Key West

Date	Current Year actual* / forecast**	last year	10 years average
Jan 1	73.0°F	75.5°F	74.8°F
Jan 2	72.3°F	75.2°F	74.9°F
Jan 3	71.7°F	75.6°F	75.2°F
Jan 4	72.2°F	73.7°F	75.2°F
Jan 5	72.7°F	73.1°F	74.7°F
Jan 6	73.7°F	73.0°F	74.5°F
Jan 7	73.4°F	71.7°F	74.0°F
Jan 8	73.8°F	72.1°F	74.2°F
Jan 9	74.4°F	71.4°F	73.9°F
Jan 10	74.6°F	69.4°F	73.6°F
Jan 11	74.7°F	68.5°F	73.2°F
Jan 12	74.9°F	68.5°F	73.1°F
Jan 13	75.3°F	67.7°F	73.3°F
Jan 14	73.8°F	69.0°F	73.2°F
Jan 15	74.2°F	69.5°F	72.9°F
Jan 16	74.0°F	69.3°F	72.7°F
Jan 17	73.9°F	69.1°F	72.6°F
Jan 18	74.1°F	69.6°F	72.8°F
Jan 19	73.5°F	70.1°F	72.2°F
Jan 20	73.6°F	71.3°F	72.3°F
Jan 21	73.8°F	71.5°F	72.5°F
Jan 22	73.7°F	69.5°F	72.3°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 334 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.