Rosslake Water Temperature
Rosslake in Putnam County, Florida averages about 81°F at the surface in summer — warmest in Jul (~82°F) and coldest in Mar (~65°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 19 field readings (2018–2020) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Rosslake 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? Rosslake scored F 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 ~89°F
Summer average ~84°F
Summer average ~84°F
Summer average ~82°F
Summer average ~86°F
Typical monthly temps
Explore water temperatures
Where to stay near Rosslake
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Frequently asked questions
What is the water temperature of Rosslake?
Rosslake has a typical summer surface temperature of about 81°F. It is usually warmest in July (around 82°F) and coldest in March (around 65°F). These are typical values by month from 19 EPA Water Quality Portal field readings (2018–2020), not a live reading.
When is Rosslake warmest?
Surface water at Rosslake 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 Rosslake warm enough to swim?
At its typical summer peak of about 81°F, Rosslake 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 Rosslake 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 — 19 readings from 1 monitoring station between 2018 and 2020. 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.