Key West — Water Temperature in January

Water Temperature Range

19°C

minimum

22°C

average

24°C

maximum

Get instant access to real-time water temperatures for this and all other locations with our iOS and Android apps.

Water Temperature Chart for Month

The chart shows the average daily water temperature for each day of the month based on historical data.

Table of Water Temperatures by Day of the Month for Previous Years

Day	2026	2025	2024	2023
JAN 1	23°C	24°C	25°C	24°C
JAN 2	24°C	24°C	23°C	24°C
JAN 3	23°C	25°C	23°C	19°C
JAN 4	23°C	24°C	24°C	19°C
JAN 5	21°C	24°C	24°C	24°C
JAN 6	21°C	24°C	24°C	20°C
JAN 7	21°C	21°C	23°C	23°C
JAN 8	22°C	22°C	23°C	21°C
JAN 9	22°C	22°C	23°C	24°C
JAN 10	22°C	22°C	24°C	22°C
JAN 11	22°C	21°C	22°C	20°C
JAN 12	22°C	21°C	23°C	21°C
JAN 13	23°C	21°C	23°C	21°C
JAN 14	23°C	21°C	23°C	20°C
JAN 15	23°C	20°C	23°C	24°C
JAN 16	23°C	20°C	23°C	23°C
JAN 17	24°C	20°C	22°C	19°C
JAN 18	24°C	21°C	23°C	21°C
JAN 19	23°C	20°C	22°C	20°C
JAN 20	24°C	21°C	22°C	24°C
JAN 21	24°C	22°C	22°C	21°C
JAN 22	23°C	22°C	23°C	19°C
JAN 23	22°C	22°C	22°C	24°C
JAN 24	20°C	22°C	22°C	21°C
JAN 25	21°C	22°C	23°C	24°C
JAN 26	20°C	20°C	23°C	23°C
JAN 27	21°C	20°C	24°C	20°C
JAN 28	23°C	20°C	24°C	19°C
JAN 29	22°C	20°C	23°C	20°C
JAN 30	23°C	21°C	23°C	21°C
JAN 31	22°C	22°C	24°C	21°C

January: Climate and Swimming Opportunities

Average Night Air Temperature

16°C

Average Day Air Temperature

23°C

Precipitation Amount per Month

44 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

7 hrs

Average Wind Speed

18 km/h

Average Humidity

75%

With such a ratio between the average monthly temperatures of water and air, swimming feels warm and comfortable even if the day isn’t hot. The water can feel warmer than the air, so getting out may feel a bit cool.