Lake St. Louis — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake St. Louis, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake St. Louis today is 18.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| JUN 3 | 14.9°C | 15.0°C | |
| JUN 4 | 14.9°C | 15.0°C | |
| JUN 5 | 15.5°C | 15.0°C | |
| JUN 6 | 16.1°C | 15.0°C | |
| JUN 7 | 17.8°C | 15.0°C | |
| JUN 8 | 17.8°C | 15.0°C | |
| JUN 10 | 18.2°C | 15.0°C | |
| JUN 11 | 15.0°C | 18.3°C | |
| JUN 12 | 15.0°C | 18.2°C | |
| JUN 13 | 15.0°C | 18.0°C | |
| JUN 14 | 15.0°C | 17.8°C | |
| JUN 15 | 15.0°C | 17.6°C | |
| JUN 16 | 15.0°C | 17.5°C | |
| JUN 17 | 15.0°C | 17.3°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 0°C | 3°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 2°C | 4°C |
| April | 0°C | 5°C | 10°C |
| May | 3°C | 9°C | 15°C |
| June | 10°C | 15°C | 20°C |
| July | 20°C | 24°C | 27°C |
| August | 19°C | 21°C | 24°C |
| September | 16°C | 21°C | 25°C |
| October | 8°C | 12°C | 16°C |
| November | 2°C | 6°C | 10°C |
| December | 1°C | 4°C | 6°C |
Lake St. Louis: Water Temperature by Location
Lake St. Louis: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Lake St. Louis in New York experiences the seasonal temperature swings typical of small temperate lakes. In winter the surface is at or near freezing, roughly 32–40°F (0–4°C) and often frozen over for periods when sustained cold sets in. Spring sees a steady rise as melt and warming air push surface waters to about 40–60°F (4–16°C). During summer the most comfortable swimming conditions occur, with surface temperatures commonly in the 68–80°F range (20–27°C), occasionally a few degrees warmer during heat waves. By autumn the lake cools again to roughly 50–65°F (10–18°C) as stratification breaks down and cooler nights dominate.
Swimming in Lake St. Louis is possible but depends on local rules, access and current conditions. Many lakes in the region allow recreational swimming in designated areas or from private shorelines, but access can be limited by property ownership or community association regulations. Seasonal factors such as ice cover in winter, cold surface temperatures in early spring and late fall, algal blooms or elevated bacterial counts can lead public health advisories or temporary closures, and the presence or absence of lifeguards affects safety. Before swimming it is best to check local lake association notices or county health updates for water quality, permitted swimming areas and any seasonal restrictions.