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Fountain, IL Weather Forecast
Fountain, IL Weather Forecast Date: 532 PM CDT Wed Sep 23 2026
The area/counties/county of: Monroe County Il, Jefferson County Mo.or toggle through each period.
Tonight... Mostly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.
Thursday... Partly sunny. Highs in the mid 70s. Northeast winds around 5 mph.
Thursday Night... Mostly cloudy. Lows in the upper 50s. Northeast winds around 5 mph in the evening, becoming light and variable.
Friday... Partly sunny. Highs in the upper 70s. East winds around 5 mph.
Friday Night... Mostly cloudy. Lows in the mid 50s. East winds around 5 mph.
Saturday... Mostly cloudy. A slight chance of showers in the morning, then a chance of showers in the afternoon. Highs in the lower 70s. Chance of rain 30%.
Saturday Night... Mostly cloudy. A 20% chance of showers. Lows in the mid 50s. Highs in the upper 70s.
Sunday... Mostly cloudy. A 20% chance of showers. Lows in the mid 50s. Highs in the upper 70s.
Sunday Night... Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.
Monday... Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.
Tuesday... Mostly sunny. A chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50%.
Tuesday Night... Showers likely with a slight chance of thunderstorms. Lows in the lower 60s. Chance of rain 70%.
POP = Probability of Precipitation
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