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: Fair 82°F 2025-06-21T23:53:00-05:00 
Overnight 2025-06-22, Clear. Clear, with a low around 75. South wind 6 to 9 mph.
Sunday 2025-06-22, Sunny. Sunny, with a high near 96. Heat index values as high as 104. South wind 7 to 13 mph.
Sunday Night 2025-06-22, Mostly Clear. Mostly clear, with a low around 75. South wind 6 to 10 mph.
Monday 2025-06-23, Sunny. Sunny, with a high near 96. Heat index values as high as 103. Southwest wind 5 to 9 mph.- Monday Night 2025-06-23, Mostly Clear. Mostly clear, with a low around 76. South wind 3 to 8 mph.
Tuesday 2025-06-24, Slight Chance T-storms. A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 95.- Tuesday Night 2025-06-24, Partly Cloudy. Partly cloudy, with a low around 74.
- Wednesday 2025-06-25, Sunny. Sunny, with a high near 93.
- Wednesday Night 2025-06-25, Mostly Clear. Mostly clear, with a low around 75.
Thursday 2025-06-26, Sunny then Slight Chance T-storms. A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94.
Thursday Night 2025-06-26, Slight Chance T-storms. A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Friday 2025-06-27, Chance T-storms. A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.- Friday Night 2025-06-27, Slight Chance T-storms. A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Saturday 2025-06-28, Chance T-storms. A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.