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Marietta, IL Weather Forecast
Marietta, IL Weather Forecast Date: 637 PM CDT Sat Sep 26 2026
The area/counties/county of: Fulton, including the city of Canton.or toggle through each period.
Tonight... Mostly cloudy. A slight chance of showers this evening. Lows in the upper 50s. East winds around 5 mph. Chance of rain 20%.
Sunday... Partly sunny. Highs in the lower 70s. East winds around 5 mph.
Sunday Night... Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 50s. Northeast winds around 5 mph.
Monday... Sunny. Highs in the lower 70s. Northeast winds around 5 mph in the morning, becoming light and variable.
Monday Night... Mostly clear. Lows in the mid 50s. Light and variable winds.
Tuesday... Partly sunny. Highs in the mid 70s.
Tuesday Night... Mostly cloudy. A chance of showers in the evening, then showers likely with a chance of thunderstorms after midnight. Lows in the mid 60s. Chance of rain 60%.
Wednesday... Showers likely. Highs in the lower 70s. Lows in the mid 60s. Chance of rain 60%.
Wednesday Night... Showers likely. Highs in the lower 70s. Lows in the mid 60s. Chance of rain 60%.
Thursday... Showers likely. Highs in the lower 70s. Chance of rain 70%.
Thursday Night... Mostly cloudy. A chance of showers. Lows around 60. Highs in the upper 60s. Chance of rain 50%.
Friday... Mostly cloudy. A chance of showers. Lows around 60. Highs in the upper 60s. Chance of rain 50%.
Friday Night... Partly cloudy. Lows in the mid 50s. Highs around 70.
POP = Probability of Precipitation
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