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City of Marion, ILMarion, IL 7-Day Night Weather Forecast
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Marion, IL Weather Forecast
Marion, IL Weather Forecast Date: 547 PM CDT Tue Sep 15 2026
The area/counties/county of: Williamson, including the city of Herrin.or toggle through each period.
Tonight... Mostly clear. Lows in the mid 70s. South winds around 5 mph.
Wednesday... Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph.
Wednesday Night... Partly cloudy in the evening, then clearing. Lows in the mid 70s. South winds around 5 mph.
Thursday... Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph.
Thursday Night... Mostly clear. Lows in the lower 70s. Calm winds.
Friday... Mostly clear. Hot. Highs in the mid 90s. Lows in the lower 70s.
Saturday... Mostly clear. Hot. Highs in the mid 90s. Lows in the lower 70s.
Sunday... Partly cloudy. Highs in the mid 90s. Lows in the upper 60s.
Sunday Night... Partly cloudy. Highs in the mid 90s. Lows in the upper 60s.
Monday... Partly sunny. A chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 40%.
Monday Night... Mostly cloudy. Lows in the mid 60s. Highs in the lower 80s.
POP = Probability of Precipitation
Marion Radar Loop
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