Big Sand Lake Water Temperature
Big Sand Lake in Burnett County, Wisconsin typically sits around 66°F at the surface in September — warmest in Jul (~72°F) and coldest in Oct (~50°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 90 field readings (2025–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Big Sand Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Big Sand 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 Big Sand Lake
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Frequently asked questions
What is the water temperature of Big Sand Lake?
Big Sand Lake typically sits around 66°F at the surface in September, from 90 EPA Water Quality Portal field readings (2025–2025). That is a typical value for the month, not a live reading.
When is Big Sand Lake warmest?
Surface water at Big Sand Lake is typically warmest in July, reaching about 72°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 Big Sand Lake warm enough to swim?
At its typical summer peak of about 69°F, Big Sand Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Big Sand 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 — 90 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.