10-Day Weather Forecast - Collinsville, IL

Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 107.

Mostly clear. Lows in the upper 70s. South winds around 5 mph in the evening, becoming light and variable. Heat index values up to 105 early in the evening.

Sunny, hot with highs in the upper 90s. West winds around 5 mph. Heat index values up to 106.

Mostly clear. Lows in the lower 70s. Northeast winds around 5 mph. Heat index values up to 102 early in the evening.

Mostly clear. Hot. Highs in the mid 90s. Heat index values up to 100.

Mostly clear. Hot. Lows in the upper 60s. Heat index values up to 100.

Mostly clear. Hot. Highs in the mid 90s. Heat index values up to 100.

Mostly clear. Hot. Lows in the upper 60s. Heat index values up to 100.

Mostly clear. Hot. Highs in the mid 90s. Heat index values up to 100.

Mostly clear. Hot. Lows in the mid 70s. Heat index values up to 105.

Mostly clear. Hot. Highs in the upper 90s. Heat index values up to 105.

Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening.

Mostly sunny with a slight chance of showers and thunderstorms. Highs in the mid 90s. Chance of rain 20 percent.

Clear. Low temperature around 77F. Dew point will be around 70F with an average humidity of 68%. Winds will be 4 mph from the S.

Mostly sunny. High temperature around 91F. Dew point will be around 70F with an average humidity of 60%. Winds will be 4 mph from the SW.

Clear. Low temperature around 72F. Dew point will be around 69F with an average humidity of 74%. Winds will be 3 mph from the SE.

Sunny. High temperature around 89F. Dew point will be around 70F with an average humidity of 65%. Winds will be 4 mph from the S.

Clear. Low temperature around 72F. Dew point will be around 67F with an average humidity of 71%. Winds will be 4 mph from the SE.