Grand Sable Lake Water Temperature
Grand Sable Lake in Alger County, Michigan averages about 59°F at the surface in summer — warmest in Aug (~61°F) and coldest in May (~48°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 1,423 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Grand Sable Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? Grand Sable Lake scored B 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 ~72°F
Summer average ~68°F
Summer average ~65°F
Summer average ~61°F
Summer average ~50°F
Summer average ~59°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Grand Sable Lake?
Grand Sable Lake has a typical summer surface temperature of about 59°F. It is usually warmest in August (around 61°F) and coldest in May (around 48°F). These are typical values by month from 1,423 EPA Water Quality Portal field readings (2010–2024), not a live reading.
When is Grand Sable Lake warmest?
Surface water at Grand Sable Lake is typically warmest in August, reaching about 61°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 Grand Sable Lake warm enough to swim?
At its typical summer peak of about 59°F, Grand Sable Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this Grand Sable 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 — 1,423 readings from 3 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.