Townline Lake Water Temperature
Townline Lake in Oneida County, Wisconsin averages about 66°F at the surface in summer — warmest in Jun (~67°F) and coldest in Feb (~38°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 14 field readings (2025–2026) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Townline Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Townline Lake scored C on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Wisconsin lakes
Summer average ~68°F
Summer average ~63°F
Summer average ~75°F
Summer average ~63°F
Summer average ~65°F
Summer average ~77°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Townline Lake?
Townline Lake has a typical summer surface temperature of about 66°F. It is usually warmest in June (around 67°F) and coldest in February (around 38°F). These are typical values by month from 14 EPA Water Quality Portal field readings (2025–2026), not a live reading.
When is Townline Lake warmest?
Surface water at Townline Lake is typically warmest in June, reaching about 67°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 Townline Lake warm enough to swim?
At its typical summer peak of about 66°F, Townline Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Townline 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 — 14 readings from 2 monitoring stations between 2025 and 2026. 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.