Lake Johio Water Temperature
Lake Johio in Orange County, Florida averages about 83°F at the surface in summer — warmest in Aug (~83°F) and coldest in Feb (~66°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 26 field readings (2018–2025) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Lake Johio 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? Lake Johio scored A on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Florida lakes
Summer average ~83°F
Typical monthly temps
Summer average ~84°F
Summer average ~84°F
Summer average ~84°F
Summer average ~83°F
Explore water temperatures
Where to stay near Lake Johio
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Frequently asked questions
What is the water temperature of Lake Johio?
Lake Johio has a typical summer surface temperature of about 83°F. It is usually warmest in August (around 83°F) and coldest in February (around 66°F). These are typical values by month from 26 EPA Water Quality Portal field readings (2018–2025), not a live reading.
When is Lake Johio warmest?
Surface water at Lake Johio is typically warmest in August, reaching about 83°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 Johio warm enough to swim?
At its typical summer peak of about 83°F, Lake Johio 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 Lake Johio 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 — 26 readings from 1 monitoring station between 2018 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.