Saint Mary'S River Shore Lake Water Temperature
Saint Mary'S River Shore Lake in Chippewa County, Michigan averages about 60°F at the surface in summer — warmest in Aug (~65°F) and coldest in May (~47°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 673 field readings (2010–2022) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Saint Mary'S River Shore Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Saint Mary'S River Shore Lake scored A on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Michigan lakes
Summer average ~59°F
Summer average ~68°F
Summer average ~66°F
Summer average ~61°F
Summer average ~71°F
Summer average ~70°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Saint Mary'S River Shore Lake?
Saint Mary'S River Shore Lake has a typical summer surface temperature of about 60°F. It is usually warmest in August (around 65°F) and coldest in May (around 47°F). These are typical values by month from 673 EPA Water Quality Portal field readings (2010–2022), not a live reading.
When is Saint Mary'S River Shore Lake warmest?
Surface water at Saint Mary'S River Shore Lake is typically warmest in August, reaching about 65°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 Saint Mary'S River Shore Lake warm enough to swim?
At its typical summer peak of about 60°F, Saint Mary'S River Shore Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Saint Mary'S River Shore 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 — 673 readings from 4 monitoring stations between 2010 and 2022. 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.