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Big Flat Lake, IL Weather Forecast
Big Flat Lake, IL Weather Forecast Date: 549 AM CDT Sat Oct 31 2026
The area/counties/county of: Clinton County Il, including the cities of: Centralia and Salem.or toggle through each period.
Today... Cloudy with a chance of sprinkles. Highs in the lower 70s. East winds around 5 mph.
Tonight... Mostly cloudy. Rain likely after midnight. Lows in the mid 50s. East winds around 5 mph. Chance of rain 70%.
Sunday... Cloudy. Rain likely, mainly in the morning. Highs in the mid 60s. Southeast winds 5 to 10 mph. Chance of rain 70%.
Sunday Night... Mostly cloudy. Lows in the lower 50s. Southeast winds 5 to 10 mph.
Monday... Mostly cloudy. Highs in the upper 60s. Southeast winds 10 to 15 mph with gusts up to 25 mph.
Monday Night... Mostly cloudy. A slight chance of showers after midnight. Lows in the upper 50s. Chance of rain 20%.
Tuesday... Showers likely with a slight chance of thunderstorms. Breezy. Highs in the lower 70s. Lows in the mid 50s. Chance of rain 70%.
Tuesday Night... Showers likely with a slight chance of thunderstorms. Breezy. Highs in the lower 70s. Lows in the mid 50s. Chance of rain 70%.
Wednesday... Mostly cloudy in the morning, then becoming partly sunny. A 50% chance of showers. Highs in the upper 60s.
Wednesday Night... Partly cloudy. A 20% chance of showers. Lows in the upper 40s. Highs in the upper 60s.
Thursday... Partly cloudy. A 20% chance of showers. Lows in the upper 40s. Highs in the upper 60s.
Thursday Night... Partly cloudy. Lows in the mid 40s. Highs in the mid 60s.
POP = Probability of Precipitation
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