10-Day Weather Forecast - Marietta, IL

Mostly sunny. A chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. Southwest winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 50 percent. Heat index values up to 100.

Mostly cloudy with a chance of thunderstorms. Showers likely mainly in the evening. Humid with lows in the lower 70s. Southwest winds 15 to 20 mph diminishing to 5 to 10 mph after midnight. Chance of rain 70 percent.

Mostly sunny. A chance of showers in the morning then showers with a chance of thunderstorms in the afternoon. Humid with highs in the lower 90s. South winds 15 to 20 mph. Chance of rain 80 percent. Heat index values up to 102.

Showers likely with a chance of thunderstorms in the evening then partly cloudy after midnight. Cooler with lows around 60. Southwest winds 15 to 20 mph with gusts up to 30 mph becoming northwest 5 to 10 mph with gusts up to 20 mph after midnight. Chance of rain 70 percent.

Clear. Highs in the lower 80s. Lows around 60.

Clear. Highs in the lower 80s. Lows around 60.

Sunny. Highs in the mid 80s.

Mostly clear with a chance of showers and thunderstorms in the evening then mostly cloudy with a chance of showers after midnight. Lows in the lower 60s. Chance of rain 50 percent.

Partly sunny with a chance of showers and thunderstorms. Highs in the lower 80s. Chance of rain 50 percent.

Mostly cloudy. A chance of showers in the evening. Lows in the upper 50s. Chance of rain 40 percent.

Partly sunny. Highs in the upper 70s.

Partly cloudy. Lows in the mid 50s.

Sunny. Highs in the upper 70s.

Mostly clear with a slight chance of rain. Chance of precipitation 30%. Low temperature around 60F. Dew point will be around 57F with an average humidity of 77%. Winds will be 4 mph from the SW.

Mostly sunny with a slight chance of rain. Chance of precipitation 30%. High temperature around 78F. Dew point will be around 60F with an average humidity of 69%. Winds will be 5 mph from the SW.

Mostly clear with a chance of rain. Chance of precipitation 35%. Low temperature around 66F. Dew point will be around 62F with an average humidity of 71%. Winds will be 6 mph from the SW.

Mostly sunny with a 35% chance for rain and thunderstorms. High temperature around 82F. Dew point will be around 64F with an average humidity of 67%. Winds will be 6 mph from the SW.

Clear with a 40% chance for rain and thunderstorms. Low temperature around 69F. Dew point will be around 66F with an average humidity of 74%. Winds will be 3 mph from the SW.