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Florida Keys Sea Temperature in January

Florida, United States

December Florida Keys year-round → February

Average sea temperature for Florida Keys, United States across January, based on 10 years of daily readings.

Average

20.79° C

High

24.14° C

Low

16.84° C

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

January is the 12th warmest of 12 months at Florida Keys. On average the water sits 5.5° than the year-round mean of 26.29° C.

Compared to December, January is 1.9° cooler than (22.69° C in December). By February the water is usually 21.36° C.

Florida Keys Day-by-Day Water Temperature in January

10-year low, average and high

15.5° C
18.0° C
20.5° C
23.0° C
25.5° C
1
5
10
15
20
25
31
Day-by-day low and high band with the 10-year daily average through January. Range Average

Each vertical bar above is one day of January. The shaded band covers the range the water has reached on that day across the last 10 years — the lowest reading at the bottom, the highest at the top. The line running through the bars is the daily average over those 10 years, so you can see the typical shape of the month at Florida Keys.

A narrow band means the temperature on that day has stayed close to the average year on year. A taller band means it has swung more, often because of changeable weather around that time of year. Hovering a day pulls up its low, average, and high.

January Water Temperature Table for Florida Keys

10-year daily averages

Day Average Low High
January 1 21.92° C 20.32° C 23.98° C
January 2 21.89° C 20.17° C 24.14° C
January 3 21.82° C 20.23° C 24.08° C
January 4 21.82° C 20.09° C 23.74° C
January 5 21.67° C 19.73° C 23.49° C
January 6 21.49° C 19.3° C 23.48° C
January 7 21.45° C 18.91° C 23.66° C
January 8 21.31° C 18.96° C 23.62° C
January 9 21.2° C 19.21° C 23.67° C
January 10 21.02° C 18.98° C 23.83° C
January 11 21.02° C 18.88° C 23.85° C
January 12 21.1° C 18.95° C 23.65° C
January 13 21.12° C 19.35° C 23.4° C
January 14 21.01° C 19.32° C 23.12° C
January 15 20.85° C 18.75° C 22.85° C
January 16 20.68° C 18.7° C 22.79° C
January 17 20.57° C 18.46° C 22.45° C
January 18 20.41° C 17.46° C 22.3° C
January 19 20.41° C 17.31° C 22.22° C
January 20 20.32° C 16.84° C 22.28° C
January 21 20.3° C 17.38° C 22° C
January 22 20.28° C 17.8° C 22.44° C
January 23 20.29° C 18.37° C 22.25° C
January 24 20.17° C 18.4° C 21.9° C
January 25 20.19° C 18.19° C 21.71° C
January 26 20.28° C 17.8° C 21.76° C
January 27 20.38° C 17.8° C 22.34° C
January 28 20.2° C 17.94° C 21.92° C
January 29 19.95° C 18.06° C 21.33° C
January 30 19.65° C 18.19° C 21.34° C
January 31 19.63° C 18.3° C 21.68° C

Where January Sits in the Year

January highlighted

14.0° C
19.3° C
24.5° C
29.8° C
35.0° C
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
20.79° C
21.36° C
23.32° C
25.42° C
27.66° C
29.41° C
30.61° C
30.71° C
30.17° C
28.12° C
25.21° C
22.69° C
10-year monthly history for Florida Keys. Bars span historical low to high; the line marks the monthly average. Range Average
January → February → March → April → May → June → July → August → September → October → November → December →

Nearby Locations in January

Compare other United States water for the same month

Florida Keys Location

25.0273, -81.5358

25.02734, -81.53575 View on OpenStreetMap →

Florida Keys sits at 25.0273°N, 81.5358°W, on the coast of Florida, United States. The marker on the map shows the spot the readings on this page come from. It usually sits a short distance from the town centre, out on the open water itself, so the numbers stay tied to the coast rather than a generic point inland.

Coastlines bend, headlands focus the water, and the temperature can run noticeably differently between two beaches that look close together on a map. Comparing nearby locations is a quick way to see how local geography is shaping the readings.

Nearest locations to Florida Keys