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 79°F 2025-06-16T14:53:00-05:00 
This Afternoon 2025-06-16, Chance T-storms. A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Southeast wind around 5 mph.Tonight 2025-06-16, Slight Chance T-storms then Mostly Cloudy. A 20 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 68. Southeast wind around 5 mph becoming calm in the evening.
Tuesday 2025-06-17, Decreasing Clouds. Mostly cloudy, then gradually becoming sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon.Tuesday Night 2025-06-17, Slight Chance Showers then Partly Cloudy. A slight chance of showers between 11pm and midnight. Partly cloudy, with a low around 72. South wind around 7 mph. Chance of precipitation is 20%.
Wednesday 2025-06-18, Chance Showers then Heavy Rain. A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 86. South wind 9 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.
Wednesday Night 2025-06-18, Chance T-storms. A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 69.
Juneteenth 2025-06-19, Sunny. Sunny, with a high near 85.
Thursday Night 2025-06-19, Mostly Clear. Mostly clear, with a low around 68.- Friday 2025-06-20, Sunny. Sunny, with a high near 90.
- Friday Night 2025-06-20, Mostly Clear. Mostly clear, with a low around 75.
- Saturday 2025-06-21, Sunny. Sunny, with a high near 95.
- Saturday Night 2025-06-21, Mostly Clear. Mostly clear, with a low around 76.
- Sunday 2025-06-22, Sunny. Sunny, with a high near 94.
- Sunday Night 2025-06-22, Mostly Clear. Mostly clear, with a low around 75.
Monday 2025-06-23, Sunny then Slight Chance T-storms. A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.