Saint Louis — Water Temperature in January

Water Temperature Range

17°C

minimum

19°C

average

24°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	2026	2025	2024	2023
JAN 1	20°C	20°C	22°C	18°C
JAN 2	20°C	21°C	21°C	18°C
JAN 3	19°C	20°C	21°C	18°C
JAN 4	18°C	20°C	21°C	18°C
JAN 5	19°C	20°C	21°C	18°C
JAN 6	19°C	19°C	22°C	18°C
JAN 7	19°C	19°C	21°C	18°C
JAN 8	18°C	20°C	21°C	22°C
JAN 9	19°C	20°C	21°C	22°C
JAN 10	18°C	20°C	21°C	22°C
JAN 11	18°C	19°C	21°C	18°C
JAN 12	19°C	20°C	20°C	21°C
JAN 13	19°C	19°C	20°C	18°C
JAN 14	18°C	19°C	20°C	18°C
JAN 15	18°C	18°C	20°C	18°C
JAN 16	17°C	19°C	19°C	18°C
JAN 17	17°C	19°C	19°C	20°C
JAN 18	18°C	18°C	19°C	20°C
JAN 19	18°C	18°C	19°C	20°C
JAN 20	18°C	18°C	19°C	19°C
JAN 21	18°C	18°C	19°C	19°C
JAN 22	17°C	18°C	19°C	19°C
JAN 23	17°C	19°C	19°C	19°C
JAN 24	17°C	18°C	18°C	19°C
JAN 25	17°C	18°C	19°C	18°C
JAN 26	18°C	18°C	18°C	18°C
JAN 27	18°C	18°C	19°C	18°C
JAN 28	18°C	18°C	18°C	18°C
JAN 29	18°C	18°C	19°C	17°C
JAN 30	18°C	18°C	18°C	17°C
JAN 31	18°C	18°C	18°C	17°C

January: Climate and Swimming Opportunities

Average Night Air Temperature

17°C

Average Day Air Temperature

33°C

Precipitation Amount per Month

1 mm

Number of Rainy Days

Daylight per Day

11 hrs

Sunshine per Day

8 hrs

Average Wind Speed

12 km/h

Average Humidity

49%

With such a ratio between the average monthly temperatures of water and air, the swim feels brisk and very refreshing. The air is warm enough to make the cool water easy to handle, especially for short swims.