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Mason, IL Weather Forecast
Mason, IL Weather Forecast Date: 637 PM CDT Mon Sep 07 2026
The area/counties/county of: Effingham, including the city of Effingham.or toggle through each period.
Tonight... Mostly clear. Lows around 60. East winds around 5 mph.
Tuesday... Mostly sunny. Highs in the lower 90s. Southeast winds around 5 mph.
Tuesday Night... Partly cloudy in the evening, then clearing. Not as cool with lows around 70. South winds 5 to 10 mph.
Wednesday... Sunny, hot with highs in the mid 90s. Southwest winds 10 to 15 mph. Heat index values up to 102.
Wednesday Night... Showers likely with a chance of thunderstorms in the evening, then showers after midnight. Humid with lows in the upper 60s. Southwest winds around 5 mph. Chance of rain near 100%.
Thursday... Showers likely in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Not as warm with highs in the lower 80s. Chance of rain 70%.
Thursday Night... Partly cloudy. Lows around 60. Highs in the mid 80s.
Friday... Partly cloudy. Lows around 60. Highs in the mid 80s.
Friday Night... Partly cloudy. A chance of showers. Lows in the lower 60s. Highs in the upper 80s. Chance of rain 30%.
Saturday... Partly cloudy. A chance of showers. Lows in the lower 60s. Highs in the upper 80s. Chance of rain 30%.
Saturday Night... Mostly clear. Lows in the mid 60s. Highs in the upper 80s.
Sunday... Mostly clear. Lows in the mid 60s. Highs in the upper 80s.
POP = Probability of Precipitation
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