Dewees Island — Water Temperature in December

Water Temperature Range

11°C

minimum

16°C

average

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

6°C

Average Day Air Temperature

16°C

Precipitation Amount per Month

77 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

6 hrs

Average Wind Speed

15 km/h

Average Humidity

72%

At such water and air temperatures, swimming often feels chilly and is best for short swims. Getting out can feel cold, so it helps to have dry clothes ready right away.