North Bethany City Reservoir Water Temperature
North Bethany City Reservoir in Harrison County, Missouri averages about 80°F at the surface in summer — warmest in Aug (~82°F) and coldest in May (~66°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 17 field readings (2015–2022) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is North Bethany City Reservoir warm enough to swim?
Very comfortable for swimming. Warm surface water can also favor blue-green algae in nutrient-rich lakes, so check for advisories before you go in.
Want more than temperature? North Bethany City Reservoir scored B on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Missouri lakes
Summer average ~80°F
Summer average ~83°F
Summer average ~80°F
Summer average ~79°F
Summer average ~80°F
Summer average ~81°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of North Bethany City Reservoir?
North Bethany City Reservoir has a typical summer surface temperature of about 80°F. It is usually warmest in August (around 82°F) and coldest in May (around 66°F). These are typical values by month from 17 EPA Water Quality Portal field readings (2015–2022), not a live reading.
When is North Bethany City Reservoir warmest?
Surface water at North Bethany City Reservoir is typically warmest in August, 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 North Bethany City Reservoir warm enough to swim?
At its typical summer peak of about 80°F, North Bethany City Reservoir rates as "warm" for swimming. Very comfortable for swimming. Warm surface water can also favor blue-green algae in nutrient-rich lakes, so check for advisories before you go in.
Where does this North Bethany City Reservoir 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 — 17 readings from 4 monitoring stations between 2015 and 2022. 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.