Don Williams Lake Water Temperature
Don Williams Lake in Boone County, Iowa typically sits around 76°F at the surface in August — warmest in Aug (~76°F) and coldest in May (~62°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 29 field readings (2010–2023) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Don Williams Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Don Williams Lake scored F on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Iowa lakes
Summer average ~79°F
Summer average ~76°F
Summer average ~77°F
Summer average ~78°F
Summer average ~77°F
Summer average ~77°F
Explore water temperatures
Where to stay near Don Williams Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Don Williams Lake — live availability and prices. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Don Williams Lake
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Frequently asked questions
What is the water temperature of Don Williams Lake?
Don Williams Lake typically sits around 76°F at the surface in August, from 29 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
When is Don Williams Lake warmest?
Surface water at Don Williams Lake is typically warmest in August, reaching about 76°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 Don Williams Lake warm enough to swim?
At its typical summer peak of about 74°F, Don Williams Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Don Williams 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 — 29 readings from 2 monitoring stations between 2010 and 2023. 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.