L Ste Louise Lake Water Temperature
L Ste Louise Lake in St. Charles County, Missouri typically sits around 77°F at the surface in September — warmest in Jul (~83°F) and coldest in Apr (~64°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 86 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is L Ste Louise Lake warm enough to swim?
Very comfortable for swimming. Warm surface water can also favor blue-green algae in nutrient-rich lakes, so check for advisories before you go in.
Want more than temperature? L Ste Louise Lake scored C on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Missouri lakes
Summer average ~82°F
Summer average ~83°F
Summer average ~82°F
Summer average ~81°F
Summer average ~81°F
Summer average ~84°F
Explore water temperatures
Where to stay near L Ste Louise Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near L Ste Louise Lake — live availability and prices. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near L Ste Louise Lake
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Frequently asked questions
What is the water temperature of L Ste Louise Lake?
L Ste Louise Lake typically sits around 77°F at the surface in September, from 86 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
When is L Ste Louise Lake warmest?
Surface water at L Ste Louise Lake is typically warmest in July, reaching about 83°F. Lake surface temperature lags air temperature by several weeks, so the warmest water usually arrives in mid-to-late summer even though the hottest air can come earlier.
Is L Ste Louise Lake warm enough to swim?
At its typical summer peak of about 82°F, L Ste Louise Lake rates as "warm" for swimming. Very comfortable for swimming. Warm surface water can also favor blue-green algae in nutrient-rich lakes, so check for advisories before you go in.
Where does this L Ste Louise Lake water temperature data come from?
Every temperature on this page is a typical (climatological) value computed from real surface-water field readings collected by state and federal agencies and published through the EPA Water Quality Portal — 86 readings from 2 monitoring stations between 2010 and 2024. They describe what is typical for each month, not the temperature right now.
About this data
Water temperatures are a climatology — the typical value for each month, averaged from real surface-water field readings collected by state and federal agencies and published through the EPA Water Quality Portal. They tell you what to expect, not the temperature at this moment. Actual conditions vary with recent weather, depth, and time of day.