Round Lake Water Temperature
Round Lake in Lenawee County, Michigan typically sits around 60°F at the surface in September — warmest in Jul (~62°F) and coldest in Mar (~42°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 1,397 field readings (2010–2023) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Round Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Round Lake scored A on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
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Where to stay near Round Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Round 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 Round Lake
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Frequently asked questions
What is the water temperature of Round Lake?
Round Lake typically sits around 60°F at the surface in September, from 1,397 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
When is Round Lake warmest?
Surface water at Round Lake is typically warmest in July, reaching about 62°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 Round Lake warm enough to swim?
At its typical summer peak of about 61°F, Round Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Round 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 — 1,397 readings from 2 monitoring stations between 2010 and 2023. 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.