King Lake Water Temperature
King Lake in Marinette County, Wisconsin averages about 51°F at the surface in summer — warmest in Sep (~55°F) and coldest in Apr (~42°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 287 field readings (2024–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is King Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? King Lake scored A on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
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Frequently asked questions
What is the water temperature of King Lake?
King Lake has a typical summer surface temperature of about 51°F. It is usually warmest in September (around 55°F) and coldest in April (around 42°F). These are typical values by month from 287 EPA Water Quality Portal field readings (2024–2025), not a live reading.
When is King Lake warmest?
Surface water at King Lake is typically warmest in September, reaching about 55°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 King Lake warm enough to swim?
At its typical summer peak of about 51°F, King Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this King 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 — 287 readings from 1 monitoring station between 2024 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.