Where is Forest Lake?

Forest Lake is a reservoir in Illinois.

What is the water temperature at Forest Lake?

As of August 22, 2026, the water temperature at Forest Lake in Illinois is 73°F (23°C), measured by NOAA buoy 45198, 17.4 miles away.

What amenities does Forest Lake have?

Visitor-listed amenities at Forest Lake include camping-nearby.

Updated June 13, 2026

Forest 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.

See full conditions ↓Can I swim today? →

Good to swimRainy todaycamping-nearby

Interactive map not available

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 45198, as of Aug 22, 10:10 AM UTC

Water temp

73°F

23°C

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

Live data from NOAA buoy 45198 (17.4 mi away), as of Aug 22, 10:10 AM UTC.

Live map near here →

Weather at Forest Lake

H: 82° L: 66°

Patchy rain nearby

66°

Feels like 67°

Precipitation

57%

Humidity

94%

Wind

7 mph

UV Index

Water Conditions:

🏊Cool but swimmable🌧️Rain expected

12 AM

68°

3 AM

66°

6 AM

66°

9 AM

69°

12 PM

77°

3 PM

82°

6 PM

78°

9 PM

72°

Pack smarter for Forest Lake

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

As an Amazon Associate we earn from qualifying purchases.

Inflatable PaddleboardA popular way to explore calm coves and shorelines.

Compare on Amazon →

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 Forest Lake?: Forest Lake is a reservoir in Illinois.
What is the water temperature at Forest Lake?: As of August 22, 2026, the water temperature at Forest Lake in Illinois is 73°F (23°C), measured by NOAA buoy 45198, 17.4 miles away.
Can you swim at Forest Lake?: Comfortable for a swim today: water temperature is 73°F, within the comfortable 70–86°F range. Checked August 22, 2026.
What amenities does Forest Lake have?: Visitor-listed amenities at Forest Lake include camping-nearby.

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Water temperatureCrowds & parkingBest time to goSafety & access

Best Times to Visit

🌧️

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

Illinois

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