Where is Green Isle Lake?

Green Isle Lake is a reservoir in Wisconsin.

What is the water temperature at Green Isle Lake?

As of August 22, 2026, the water temperature at Green Isle Lake in Wisconsin is 73°F (23°C), measured by NOAA buoy 45013, 43.9 miles away.

Updated June 13, 2026

Green Isle Lake

Reservoir

Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 73°F, within the comfortable 70–86°F range.

Water temperature is 73°F, within the comfortable 70–86°F range.
Heavy rain today can raise bacteria levels near outfalls and river mouths.

See full conditions ↓Can I swim today? →

Good to swimRainy today

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Comfortable for a swim today

Good to swim

Comfortable for a swim today: water temperature is 73°F, within the comfortable 70–86°F range.

Water temperature is 73°F, within the comfortable 70–86°F range. — NOAA buoy 45013, as of Aug 22, 3:00 AM UTC
Heavy rain today can raise bacteria levels near outfalls and river mouths.

Water temp

73°F

23°C

No official beach-advisory feed for Wisconsin yet — follow posted signs and local guidance.

Live data from NOAA buoy 45013 (43.9 mi away), as of Aug 22, 3:00 AM UTC.

Live map near here →

Weather at Green Isle Lake

H: 77° L: 61°

Patchy rain nearby

67°

Feels like 67°

Precipitation

80%

Humidity

92%

Wind

9 mph

UV Index

Water Conditions:

🏊Cool but swimmable🌧️Rain expected

12 AM

64°

3 AM

63°

6 AM

61°

9 AM

70°

12 PM

65°

3 PM

73°

6 PM

77°

9 PM

69°

Pack smarter for Green Isle Lake

Useful gear categories for this kind of water spot. These links open Amazon search results so you can compare current options.

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Inflatable PaddleboardA popular way to explore calm coves and shorelines.

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Life JacketImportant around boats, paddling, and deeper swimming areas.

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Floating CoolerKeeps drinks nearby for swim areas, docks, and boats.

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Waterproof Phone PouchProtects phones around docks, boats, and splashy shorelines.

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Frequently asked questions

Where is Green Isle Lake?: Green Isle Lake is a reservoir in Wisconsin.
What is the water temperature at Green Isle Lake?: As of August 22, 2026, the water temperature at Green Isle Lake in Wisconsin is 73°F (23°C), measured by NOAA buoy 45013, 43.9 miles away.
Can you swim at Green Isle Lake?: Comfortable for a swim today: water temperature is 73°F, within the comfortable 70–86°F range. Checked August 22, 2026.

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Best Times to Visit

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Right Now

Not ideal for outdoor activities today

🏞️ Lakes Tips:

›Check for boat launch facilities and fees
›Obtain required fishing licenses before arrival
›Be aware of lake-specific regulations and restrictions
›Monitor water quality reports before swimming

Best Seasons:

☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)

Location & Contact

Wisconsin

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