Lake Grassy Water Temperature
Lake Grassy in Highlands County, Florida averages about 86°F at the surface in summer — warmest in Aug (~87°F) and coldest in Feb (~67°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 12 field readings (2024–2024) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Lake Grassy 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 Grassy scored B 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 ~87°F
Summer average ~85°F
Summer average ~85°F
Summer average ~86°F
Summer average ~71°F
Summer average ~88°F
Explore water temperatures
Where to stay near Lake Grassy
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Lake Grassy — 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 Lake Grassy
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a trip to Lake Grassy?
Get lake water-quality report cards plus the best cabin & lodging deals near Lake Grassy — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Lake Grassy?
Lake Grassy has a typical summer surface temperature of about 86°F. It is usually warmest in August (around 87°F) and coldest in February (around 67°F). These are typical values by month from 12 EPA Water Quality Portal field readings (2024–2024), not a live reading.
When is Lake Grassy warmest?
Surface water at Lake Grassy is typically warmest in August, reaching about 87°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 Grassy warm enough to swim?
At its typical summer peak of about 86°F, Lake Grassy 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 Grassy 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 — 12 readings from 1 monitoring station between 2024 and 2024. 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.