Seneca Lake Water Temperature
Seneca Lake in Noble County, Ohio averages about 79°F at the surface in summer — warmest in Jul (~82°F) and coldest in May (~71°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 182 field readings (2012–2021) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Seneca Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Seneca Lake scored F on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Ohio lakes
Summer average ~79°F
Summer average ~76°F
Summer average ~78°F
Summer average ~79°F
Summer average ~79°F
Summer average ~66°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Seneca Lake?
Seneca Lake has a typical summer surface temperature of about 79°F. It is usually warmest in July (around 82°F) and coldest in May (around 71°F). These are typical values by month from 182 EPA Water Quality Portal field readings (2012–2021), not a live reading.
When is Seneca Lake warmest?
Surface water at Seneca Lake is typically warmest in July, reaching about 82°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 Seneca Lake warm enough to swim?
At its typical summer peak of about 79°F, Seneca Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Seneca 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 — 182 readings from 2 monitoring stations between 2012 and 2021. 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.