Fernandina Beach — Water Temperature in December

Water Temperature Range

13°C

minimum

17°C

average

21°C

maximum

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

10°C

Average Day Air Temperature

24°C

Precipitation Amount per Month

62 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

6 hrs

Average Wind Speed

16 km/h

Average Humidity

76%

At such water and air temperatures, swimming feels cool and invigorating. It’s comfortable for a quick dip, and you’ll feel fine as long as you warm up soon after.