Frances Lake Water Temperature
Frances Lake in Le Sueur County, Minnesota averages about 81°F at the surface in summer — warmest in Aug (~81°F) and coldest in May (~61°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 10 field readings (2025–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Frances 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? Frances Lake scored C on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Minnesota lakes
Summer average ~68°F
Summer average ~57°F
Summer average ~73°F
Summer average ~59°F
Summer average ~73°F
Summer average ~78°F
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Frequently asked questions
What is the water temperature of Frances Lake?
Frances Lake has a typical summer surface temperature of about 81°F. It is usually warmest in August (around 81°F) and coldest in May (around 61°F). These are typical values by month from 10 EPA Water Quality Portal field readings (2025–2025), not a live reading.
When is Frances Lake warmest?
Surface water at Frances Lake is typically warmest in August, reaching about 81°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 Frances Lake warm enough to swim?
At its typical summer peak of about 81°F, Frances 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 Frances 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 — 10 readings from 1 monitoring station between 2025 and 2025. 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.