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

70.2

°F

December 11, 03:02

Trend:

decreasing

Yesterday:

70.7°F

Tomorrow:

69.9°F

Sunrise:

07:23

Sunset:

18:35

Day Length:

11 h. 12 min.

Saint-Louis in December

Minimum:

63.3°F

Average:

66.8°F

Maximum:

71.6°F

Sea water temperature in Saint-Louis today

As of now, in Saint-Louis, the water temperature is 70.2°F. Swimming in water of this temperature is seen as relatively warm and enjoyable for some individuals, although many might find it slightly too cool. Today's reading is 0.9°F lower 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 considerably lower than the average registered over the last two weeks, indicating a slight cooling trend. It also falls within the range of the average temperature recorded for this date, suggesting a consistent weather trend. The maximum temperature recorded for this date was 72.5°F on 2015, while the historical minimum was 68.2°F on 2021.

Over the past two weeks, the water temperature has closely aligned with historical averages for those days. The forecast for the upcoming week shows a gradual cooling trend. The average temperature is expected to be 69.8°F, the minimum temperature may reach 69.6°F, and the maximum might stay at 69.9°F.

Daily water temperature in Saint-Louis

Date Current Year

actual* / forecast**

last year 10 years average
Nov 27 74.3°F 72.4°F 73.5°F
Nov 28 73.5°F 73.3°F 73.2°F
Nov 29 73.4°F 73.0°F 72.6°F
Nov 30 73.1°F 73.1°F 72.5°F
Dec 1 72.9°F 71.9°F 72.3°F
Dec 2 72.9°F 72.0°F 72.4°F
Dec 3 72.7°F 72.2°F 72.6°F
Dec 4 72.6°F 72.2°F 72.4°F
Dec 5 71.7°F 72.4°F 72.2°F
Dec 6 71.6°F 72.3°F 72.1°F
Dec 7 71.4°F 72.6°F 71.9°F
Dec 8 71.2°F 73.8°F 72.1°F
Dec 9 71.0°F 73.3°F 71.8°F
Dec 10 70.7°F 72.7°F 71.6°F
Dec 11 70.2°F 72.3°F 71.1°F
Dec 12 69.9°F 72.7°F 70.8°F
Dec 13 69.8°F 73.2°F 70.7°F
Dec 14 69.7°F 72.7°F 70.6°F
Dec 15 69.6°F 71.8°F 70.5°F
Dec 16 69.9°F 72.1°F 70.8°F
Dec 17 69.9°F 71.9°F 70.7°F
Dec 18 69.7°F 71.9°F 70.5°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 80.6°F in Autumn.