Alys Beach — Water Temperature in December

Water Temperature Range

16°C

minimum

19°C

average

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

7°C

Average Day Air Temperature

18°C

Precipitation Amount per Month

112 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

5 hrs

Average Wind Speed

12 km/h

Average Humidity

75%

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.