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Waterloo Reservoir Number 1, IL Weather Forecast
Waterloo Reservoir Number 1, IL Weather Forecast Date: 758 PM CDT Tue Aug 04 2026
The area/counties/county of: Monroe County Il, Jefferson County Mo.or toggle through each period.
Tonight... Mostly clear. Lows in the upper 60s. Southeast winds around 5 mph.
Wednesday... Sunny. Highs in the lower 90s. South winds 5 to 10 mph.
Wednesday Night... Mostly cloudy with a chance of showers. A chance of thunderstorms in the evening, then thunderstorms likely after midnight. Lows around 70. Southeast winds around 5 mph. Chance of rain 60%.
Thursday... Showers and thunderstorms in the morning. Humid with highs in the mid 80s. South winds around 5 mph. Chance of rain 80%.
Thursday Night... Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Humid with lows around 70. South winds around 5 mph. Chance of rain 70%.
Friday... Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50%.
Friday Night... Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 60s. Chance of rain 50%.
Saturday... Mostly sunny. Highs in the upper 80s. Heat index values up to 105.
Saturday Night... Mostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 110.
Sunday... Mostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 110.
Monday... Mostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 110.
Monday Night... Partly cloudy. Lows in the mid 70s. Highs in the lower 90s. Heat index values up to 105.
POP = Probability of Precipitation
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