Lake Harvey Water Temperature
Lake Harvey in Keweenaw County, Michigan averages about 71°F at the surface in summer — warmest in Jul (~74°F) and coldest in Jun (~67°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 482 field readings (2010–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Lake Harvey warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Lake Harvey scored A on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Michigan lakes
Summer average ~52°F
Summer average ~68°F
Summer average ~69°F
Summer average ~64°F
Summer average ~67°F
Summer average ~69°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Lake Harvey?
Lake Harvey has a typical summer surface temperature of about 71°F. It is usually warmest in July (around 74°F) and coldest in June (around 67°F). These are typical values by month from 482 EPA Water Quality Portal field readings (2010–2024), not a live reading.
When is Lake Harvey warmest?
Surface water at Lake Harvey is typically warmest in July, reaching about 74°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 Lake Harvey warm enough to swim?
At its typical summer peak of about 71°F, Lake Harvey rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Lake Harvey 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 — 482 readings from 3 monitoring stations between 2010 and 2024. 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.