North Key Largo — Water Temperature in December

Water Temperature Range

21°C

minimum

24°C

average

28°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	2025	2024	2023	2022
DEC 1	25°C	24°C	24°C	24°C
DEC 2	24°C	23°C	25°C	23°C
DEC 3	25°C	24°C	23°C	25°C
DEC 4	24°C	24°C	22°C	25°C
DEC 5	24°C	25°C	21°C	26°C
DEC 6	24°C	25°C	21°C	26°C
DEC 7	24°C	25°C	22°C	25°C
DEC 8	24°C	26°C	23°C	24°C
DEC 9	24°C	27°C	22°C	23°C
DEC 10	24°C	26°C	23°C	22°C
DEC 11	24°C	26°C	22°C	24°C
DEC 12	24°C	25°C	22°C	23°C
DEC 13	23°C	24°C	22°C	23°C
DEC 14	23°C	23°C	22°C	23°C
DEC 15	23°C	23°C	22°C	23°C
DEC 16	23°C	23°C	23°C	23°C
DEC 17	23°C	22°C	22°C	23°C
DEC 18	23°C	23°C	22°C	23°C
DEC 19	23°C	22°C	23°C	23°C
DEC 20	24°C	23°C	25°C	23°C
DEC 21	23°C	23°C	24°C	22°C
DEC 22	24°C	24°C	23°C	22°C
DEC 23	23°C	24°C	22°C	22°C
DEC 24	23°C	23°C	22°C	22°C
DEC 25	23°C	24°C	21°C	22°C
DEC 26	23°C	23°C	21°C	23°C
DEC 27	23°C	23°C	22°C	22°C
DEC 28	23°C	23°C	23°C	23°C
DEC 29	23°C	24°C	23°C	22°C
DEC 30	23°C	23°C	23°C	23°C
DEC 31	23°C	24°C	23°C	22°C

December: Climate and Swimming Opportunities

Average Night Air Temperature

17°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

42 mm

Number of Rainy Days

Daylight per Day

10 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.