What is the current water temperature in Key West?

As of now, in Key West, the water temperature is 23.71°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.

74.7

°F

January 11, 12:19

Trend:

stable

Yesterday:

74.6°F

Tomorrow:

74.6°F

Sunrise:

07:13

Sunset:

17:57

Day Length:

10 h. 44 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 74.7°F. It's safe to say that the water is comfortably warm for various water-related activities. Today's reading is 1.6°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

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 76.2°F on 2016, while the historical minimum was 68.5°F on 2025.

latest data

last year

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. Over the next week, the forecast shows a steady trend, with temperatures staying close to the average of 74.5°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
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	73.1°F
Jan 12	74.6°F	68.5°F	73.0°F
Jan 13	74.7°F	67.7°F	73.1°F
Jan 14	74.8°F	69.0°F	73.2°F
Jan 15	74.5°F	69.5°F	72.9°F
Jan 16	74.3°F	69.3°F	72.7°F
Jan 17	74.2°F	69.1°F	72.6°F
Jan 18	74.4°F	69.6°F	72.8°F
Dec 28	74.0°F	72.5°F	74.1°F
Dec 29	74.1°F	73.2°F	73.9°F
Dec 30	74.7°F	73.4°F	74.3°F
Dec 31	74.5°F	74.3°F	74.5°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.