All data are in degrees Fahrenheit

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Water temperature in Saint-Louis

Detailed information about the current water temperature in Saint-Louis. The trend over the last two weeks, daily averages, and precise forecast of the water temperature changes. Gain a deeper understanding of seasonal dynamics with monthly statistical analyses covering recent years.
Sea temperature in Saint-Louis now

84.8

°F

October 10, 20:23

Trend:

decreasing

Yesterday:

85.7°F

Tomorrow:

84.7°F

Sunrise:

06:57

Sunset:

18:49

Day Length:

11 h. 52 min.

Saint-Louis in October

Minimum:

63.2°F

Average:

67.0°F

Maximum:

71.5°F

Sea water temperature in Saint-Louis today

As of now, in Saint-Louis, the water temperature is 84.8°F. Swimming in water of this temperature is considered highly warm and would be enjoyable for everyone. At this temperature, you can comfortably engage in water-based activities for extended periods without experiencing discomfort. Today's reading is 1.3°F higher than the average recorded on this particular day in recent years. The sea temperature remains approximately unchanged from yesterday. According to the forecast, we expect the temperature to fall a bit.

Recent sea temperature and forecast

Today's water temperature is slightly lower than the average registered over the last two weeks, indicating a slight cooling trend. It is also close to the historical maximum temperature for this date. The maximum temperature recorded for this date was 85.3°F on 2023, while the historical minimum was 81.7°F on 2017.

Observations from the last two weeks indicate that the water temperature was in proximity to the highest values recorded on those days in the past. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 83.9°F, the minimum temperature may reach 83.3°F, and the maximum might stay at 84.7°F.

Daily water temperature in Saint-Louis

Date Current Year

actual* / forecast**

last year 10 years average
Sep 26 85.1°F 82.2°F 83.5°F
Sep 27 84.8°F 82.1°F 83.2°F
Sep 28 84.1°F 81.8°F 83.3°F
Sep 29 85.8°F 81.6°F 83.2°F
Sep 30 85.0°F 82.0°F 83.4°F
Oct 1 84.3°F 82.3°F 83.7°F
Oct 2 85.4°F 82.0°F 83.6°F
Oct 3 85.1°F 81.9°F 83.4°F
Oct 4 85.1°F 82.2°F 83.5°F
Oct 5 85.6°F 81.7°F 83.5°F
Oct 6 84.1°F 82.8°F 83.6°F
Oct 7 85.1°F 82.0°F 83.4°F
Oct 8 85.4°F 83.1°F 83.6°F
Oct 9 85.7°F 84.0°F 83.5°F
Oct 10 84.8°F 85.1°F 83.5°F
Oct 11 84.7°F 84.1°F 83.4°F
Oct 12 84.5°F 82.9°F 83.2°F
Oct 13 84.4°F 83.6°F 83.1°F
Oct 14 83.8°F 82.3°F 82.5°F
Oct 15 83.4°F 82.0°F 82.1°F
Oct 16 83.3°F 82.6°F 82.0°F
Oct 17 83.5°F 82.3°F 82.2°F

* actual - actual temperature values

** forecast - projected values for the next week

Real-time coastal temperatures could deviate by several degrees from the provided readings. These deviations often become evident following intense rainfall or strong winds.

Our forecasting methodology leverages a mathematical model, that uses current water and weather conditions, historical records, wind intensity and direction.

Sea water temperature in Saint-Louis by month

In Saint-Louis, the months June through November offer comfortable swimming conditions, which amounts to 171 swimming days.
The warmest water in Saint-Louis was recorded on September 18, 2025, reaching a 86.3°F. While the coldest temperature occurred on February 10, 2018, dipping to 59.6°F. The average readings by season are 67.3°F in Winter, 66.4°F in Spring, 79.0°F in Summer, and 80.4°F in Autumn.