I-55 weather conditions near Collinsville, Illinois
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Seasoned Weather Conditions
Current Weather Conditions
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7 day weather forecast
Current condition: Fair 75°F 2025-08-15T00:53:00-05:00 
Overnight 2025-08-15, Mostly Clear. Mostly clear, with a low around 70. Southeast wind around 6 mph.
Friday 2025-08-15, Sunny. Sunny, with a high near 94. Heat index values as high as 102. South wind 5 to 7 mph.- Friday Night 2025-08-15, Mostly Clear. Mostly clear, with a low around 75. Southeast wind 5 to 7 mph.
Saturday 2025-08-16, Hot. Sunny and hot, with a high near 97. Heat index values as high as 107. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night 2025-08-16, Clear. Clear, with a low around 75. Southeast wind around 5 mph becoming calm in the evening.- Sunday 2025-08-17, Hot. Sunny and hot, with a high near 97.
- Sunday Night 2025-08-17, Mostly Clear. Mostly clear, with a low around 75.
- Monday 2025-08-18, Hot. Sunny and hot, with a high near 98.
- Monday Night 2025-08-18, Mostly Clear. Mostly clear, with a low around 76.
Tuesday 2025-08-19, Sunny then Slight Chance T-storms. A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97.
Tuesday Night 2025-08-19, Chance T-storms. A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Wednesday 2025-08-20, Chance T-storms. A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Wednesday Night 2025-08-20, Slight Chance T-storms. A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 69.Thursday 2025-08-21, Mostly Sunny then Slight Chance Showers. A 20 percent chance of showers. Mostly sunny, with a high near 88.