Upper Hamlin Lake West Basin East of the Narrows Water Temperature
Upper Hamlin Lake West Basin East of the Narrows in Mason County, Michigan averages about 70°F at the surface in summer — warmest in Aug (~72°F) and coldest in May (~59°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 665 field readings (2010–2023) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Upper Hamlin Lake West Basin East of the Narrows warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Upper Hamlin Lake West Basin East of the Narrows scored C 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 ~71°F
Summer average ~71°F
Summer average ~69°F
Summer average ~72°F
Summer average ~63°F
Summer average ~65°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Upper Hamlin Lake West Basin East of the Narrows?
Upper Hamlin Lake West Basin East of the Narrows has a typical summer surface temperature of about 70°F. It is usually warmest in August (around 72°F) and coldest in May (around 59°F). These are typical values by month from 665 EPA Water Quality Portal field readings (2010–2023), not a live reading.
When is Upper Hamlin Lake West Basin East of the Narrows warmest?
Surface water at Upper Hamlin Lake West Basin East of the Narrows is typically warmest in August, reaching about 72°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 Upper Hamlin Lake West Basin East of the Narrows warm enough to swim?
At its typical summer peak of about 70°F, Upper Hamlin Lake West Basin East of the Narrows rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Upper Hamlin Lake West Basin East of the Narrows 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 — 665 readings from 1 monitoring station between 2010 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.