10-Day Weather Forecast - O'Fallon, IL
- 90|80°F
SunnyHourly detailsToday
90°FSunny. High temperature around 90F. Dew point will be around 76F with an average humidity of 76%. Winds will be 3 mph from the SE.
Tonight
80°F
Mostly clear this evening then becoming partly cloudy. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 105 early this evening.
- 93|70°F
Partly SunnyHourly detailsDay
93°FPartly sunny with a slight chance of showers and thunderstorms in the morning then sunny in the afternoon. Humid with highs in the lower 90s. Northwest winds 10 to 15 mph. Chance of rain 20 percent. Heat index values up to 104.
Night
70°F
Mostly clear. Lows in the upper 60s. North winds 10 to 15 mph diminishing to around 5 mph after midnight.
- 81|62°FSunnyHourly details
Day
81°FSunny cooler with highs in the lower 80s. North winds 5 to 10 mph.
Night
62°FPartly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph.
- 79|64°F
Mostly SunnyHourly detailsDay
79°FMostly sunny. Highs in the lower 80s.
Night
64°FMostly cloudy in the evening then partly cloudy with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent.
- 78|64°F
40% Chance of StormsHourly detailsDay
78°FPartly sunny in the morning then becoming mostly cloudy. A chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 40 percent.
Night
64°FMostly cloudy in the evening then becoming partly cloudy. A slight chance of thunderstorms in the evening. A slight chance of showers. Lows in the mid 60s. Chance of rain 20 percent.
Weekend Weather
- 86|71°FMostly SunnyHourly details
Day
86°FMostly sunny. A slight chance of showers in the morning. Highs in the upper 80s. Chance of rain 20 percent.
Night
71°FMostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105.
- 92|77°FMostly Sunny
Day
92°FMostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105.
Night
77°FMostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105.
- 97|74°F
Hot and HumidDay
97°FMostly sunny. Hot with highs in the mid 90s. Heat index values up to 105.
Night
74°F
Clear with widely scattered thunderstorms. Chance of storms 25%. Low temperature around 74F. Dew point will be around 73F with an average humidity of 76%. Winds will be 2 mph from the NW.
- 91|71°FSunny
Day
91°FSunny. High temperature around 91F. Dew point will be around 71F with an average humidity of 63%. Winds will be 2 mph from the NW.
Night
71°FClear. Low temperature around 71F. Dew point will be around 71F with an average humidity of 82%. Winds will be 1 mph from the NE.
- 89|72°FSunny
Day
89°FSunny. High temperature around 89F. Dew point will be around 70F with an average humidity of 64%. Winds will be 1 mph from the SE.
Night
72°FClear. Low temperature around 72F. Dew point will be around 71F with an average humidity of 79%. Winds will be 2 mph from the SE.
