Updated
Lake Marion
Reservoir
Use caution — an official advisory is in effect
Use cautionUse caution — an official advisory is in effect: a Severe Thunderstorm Watch is in effect for Boone, IL; Cook, IL; De Kalb, IL; DuPage, IL; Ford, IL; Grundy, IL; Iroquois, IL; Kane, IL and other areas.
- A Severe Thunderstorm Watch is in effect for Boone, IL; Cook, IL; De Kalb, IL; DuPage, IL; Ford, IL; Grundy, IL; Iroquois, IL; Kane, IL and other areas.
- Water temperature is 74°F, within the comfortable 70–86°F range.
Interactive map not available
Use caution — an official advisory is in effect
Use cautionUse caution — an official advisory is in effect: a Severe Thunderstorm Watch is in effect for Boone, IL; Cook, IL; De Kalb, IL; DuPage, IL; Ford, IL; Grundy, IL; Iroquois, IL; Kane, IL and other areas.
- A Severe Thunderstorm Watch is in effect for Boone, IL; Cook, IL; De Kalb, IL; DuPage, IL; Ford, IL; Grundy, IL; Iroquois, IL; Kane, IL and other areas. — NWS Chicago IL
- Water temperature is 74°F, within the comfortable 70–86°F range. — NOAA buoy 45198, as of Aug 21, 11:40 PM UTC
No official beach-advisory feed for Illinois yet — follow posted signs and local guidance.
Live data from NOAA buoy 45198 (14.9 mi away), as of Aug 21, 11:40 PM UTC.
Weather at Lake Marion
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Frequently asked questions
- Where is Lake Marion?
- Lake Marion is a reservoir in Illinois.
- What is the water temperature at Lake Marion?
- As of August 21, 2026, the water temperature at Lake Marion in Illinois is 74°F (23°C), measured by NOAA buoy 45198, 14.9 miles away.
- Can you swim at Lake Marion?
- Use caution — an official advisory is in effect: a Severe Thunderstorm Watch is in effect for Boone, IL; Cook, IL; De Kalb, IL; DuPage, IL; Ford, IL; Grundy, IL; Iroquois, IL; Kane, IL and other areas. Checked August 21, 2026.
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- ›Monitor water quality reports before swimming
Location & Contact
Illinois
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