Five Island Lake Water Temperature
Five Island Lake in Palo Alto County, Iowa typically sits around 69°F at the surface in September — warmest in Jul (~80°F) and coldest in Sep (~69°F). That is a typical value for the month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 26 field readings (2010–2023) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Five Island Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Five Island Lake scored F on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Iowa lakes
Summer average ~75°F
Summer average ~74°F
Summer average ~75°F
Summer average ~74°F
Summer average ~75°F
Summer average ~75°F
Explore water temperatures
Where to stay near Five Island Lake
Planning a swim or lake trip? Compare cabins, lodges, and vacation rentals near Five Island Lake — 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 Five Island Lake
Prices for Sep 4–6, 4 adults. Change dates on the map below.
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 Five Island Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Five Island Lake — straight to your inbox. No spam, unsubscribe anytime.
Frequently asked questions
What is the water temperature of Five Island Lake?
Five Island Lake typically sits around 69°F at the surface in September, from 26 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
When is Five Island Lake warmest?
Surface water at Five Island Lake is typically warmest in July, reaching about 80°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 Five Island Lake warm enough to swim?
At its typical summer peak of about 75°F, Five Island Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Five Island 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 — 26 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.