Milwaukee Harbor North Half Lake Water Temperature
Milwaukee Harbor North Half Lake in Milwaukee County, Wisconsin averages about 62°F at the surface in summer — warmest in Sep (~69°F) and coldest in Mar (~39°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 286 field readings (2024–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Milwaukee Harbor North Half Lake warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Milwaukee Harbor North Half 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 ~65°F
Summer average ~66°F
Summer average ~72°F
Summer average ~63°F
Summer average ~75°F
Summer average ~76°F
Explore water temperatures
Where to stay near Milwaukee Harbor North Half Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Milwaukee Harbor North Half Lake — live availability and prices.
Top-rated places to stay near Milwaukee Harbor North Half Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Milwaukee Harbor North Half Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Milwaukee Harbor North Half Lake — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Milwaukee Harbor North Half Lake?
Milwaukee Harbor North Half Lake has a typical summer surface temperature of about 62°F. It is usually warmest in September (around 69°F) and coldest in March (around 39°F). These are typical values by month from 286 EPA Water Quality Portal field readings (2024–2025), not a live reading.
When is Milwaukee Harbor North Half Lake warmest?
Surface water at Milwaukee Harbor North Half Lake is typically warmest in September, reaching about 69°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 Milwaukee Harbor North Half Lake warm enough to swim?
At its typical summer peak of about 62°F, Milwaukee Harbor North Half Lake rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Milwaukee Harbor North Half 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 — 286 readings from 4 monitoring stations 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.