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McCarthy Lake, IL Weather Forecast
McCarthy Lake, IL Weather Forecast Date: 1237 AM CDT Mon Oct 12 2026
The area/counties/county of: Richland, including the city of Olney.or toggle through each period.
Rest of Tonight... Mostly clear. Near steady temperature in the upper 50s. South winds around 5 mph.
Monday... Sunny. Highs in the lower 90s. Southwest winds 10 to 15 mph.
Monday Night... Mostly clear. Not as cool with lows in the upper 60s. Southwest winds 5 to 10 mph.
Tuesday... Sunny. Highs in the lower 90s. Southwest winds 5 to 10 mph.
Tuesday Night... Mostly clear in the evening, then partly cloudy with a chance of showers after midnight. Lows in the upper 60s. Southwest winds 5 to 10 mph. Chance of rain 30%.
Wednesday... Showers likely in the morning, then showers with a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 80%.
Wednesday Night... Showers likely. Lows in the mid 60s. Chance of rain 60%.
Thursday... Mostly cloudy with a chance of showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 70%.
Thursday Night... A chance of showers in the evening. Mostly cloudy. Lows in the mid 50s. Chance of rain 50%.
Friday... Mostly cloudy in the morning, then becoming mostly sunny. Cooler with highs in the upper 60s.
Friday Night... Partly cloudy. Much cooler with lows in the upper 30s.
Saturday... Sunny. Highs in the upper 50s.
Saturday Night... Clear. Lows in the mid 30s. Highs in the mid 60s.
POP = Probability of Precipitation
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