I-64 weather conditions near O Fallon, Illinois
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Seasoned Weather Conditions
Current Weather Conditions
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7 day weather forecast
Current condition: Partly Cloudy 97°F 2025-06-23T14:53:00-05:00 
Tonight 2025-06-23, Mostly Clear. Mostly clear, with a low around 76. South wind 5 to 9 mph becoming light after midnight.Tuesday 2025-06-24, Mostly Sunny then Slight Chance T-storms. A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 101. Southwest wind 3 to 7 mph.
Tuesday Night 2025-06-24, Partly Cloudy. Partly cloudy, with a low around 75. South wind around 6 mph becoming calm in the evening.
Wednesday 2025-06-25, Slight Chance T-storms. A slight chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 94. Heat index values as high as 104. Southwest wind 3 to 6 mph. Chance of precipitation is 20%.- Wednesday Night 2025-06-25, Partly Cloudy. Partly cloudy, with a low around 76. South wind around 5 mph becoming calm in the evening.
Thursday 2025-06-26, Sunny. Sunny, with a high near 95.- Thursday Night 2025-06-26, Partly Cloudy. Partly cloudy, with a low around 76.
Friday 2025-06-27, Sunny then Slight Chance T-storms. A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
Friday Night 2025-06-27, Partly Cloudy then Slight Chance T-storms. A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75.
Saturday 2025-06-28, Chance T-storms. A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Saturday Night 2025-06-28, Slight Chance T-storms. A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.Sunday 2025-06-29, Chance Showers then Chance T-storms. A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Sunday Night 2025-06-29, Chance T-storms. A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.Monday 2025-06-30, Chance Showers then Chance T-storms. A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.