Long Lake South Central Basin Water Temperature
Long Lake South Central Basin in Cass County, Michigan averages about 63°F at the surface in summer — warmest in Sep (~65°F) and coldest in May (~55°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 221 field readings (2022–2023) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Long Lake South Central Basin warm enough to swim?
Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Want more than temperature? Long Lake South Central Basin scored B on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Michigan lakes
Summer average ~60°F
Summer average ~55°F
Summer average ~66°F
Summer average ~57°F
Summer average ~66°F
Summer average ~72°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Long Lake South Central Basin?
Long Lake South Central Basin has a typical summer surface temperature of about 63°F. It is usually warmest in September (around 65°F) and coldest in May (around 55°F). These are typical values by month from 221 EPA Water Quality Portal field readings (2022–2023), not a live reading.
When is Long Lake South Central Basin warmest?
Surface water at Long Lake South Central Basin is typically warmest in September, reaching about 65°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 Long Lake South Central Basin warm enough to swim?
At its typical summer peak of about 63°F, Long Lake South Central Basin rates as "cool" for swimming. Brisk but swimmable for short dips — most people acclimate after the first few minutes.
Where does this Long Lake South Central Basin 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 — 221 readings from 1 monitoring station between 2022 and 2023. 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.