Saint Louis — Water Temperature in December

Water Temperature Range

20°C

minimum

22°C

average

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

December: Climate and Swimming Opportunities

Average Night Air Temperature

18°C

Average Day Air Temperature

33°C

Precipitation Amount per Month

0 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

8 hrs

Average Wind Speed

11 km/h

Average Humidity

52%

At such water and air temperatures, swimming is pleasant and refreshing rather than hot. After you get in, it feels comfortable, and you’ll warm up quickly when you come out.