Galveston — Water Temperature in December

Water Temperature Range

12°C

minimum

16°C

average

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

9°C

Average Day Air Temperature

19°C

Precipitation Amount per Month

94 mm

Number of Rainy Days

Daylight per Day

10 hrs

Sunshine per Day

5 hrs

Average Wind Speed

18 km/h

Average Humidity

78%

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.