Mirror Lake Water Temperature
Mirror Lake in Adams County, North Dakota averages about 59°F at the surface in summer — warmest in Jun (~61°F) and coldest in Oct (~47°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 23 field readings (2023–2023) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Mirror Lake warm enough to swim?
Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Want more than temperature? Mirror Lake scored F on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby North Dakota lakes
Summer average ~66°F
Summer average ~63°F
Summer average ~67°F
Summer average ~67°F
Summer average ~62°F
Summer average ~66°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Mirror Lake?
Mirror Lake has a typical summer surface temperature of about 59°F. It is usually warmest in June (around 61°F) and coldest in October (around 47°F). These are typical values by month from 23 EPA Water Quality Portal field readings (2023–2023), not a live reading.
When is Mirror Lake warmest?
Surface water at Mirror Lake is typically warmest in June, reaching about 61°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 Mirror Lake warm enough to swim?
At its typical summer peak of about 59°F, Mirror Lake rates as "cold" for swimming. Wetsuit territory. Brief exposure is tolerable but prolonged swimming without protection risks hypothermia.
Where does this Mirror Lake 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 — 23 readings from 2 monitoring stations between 2023 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.