I-255 IL 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 71°F 2026-05-04T09:53:00-05:00 
Today 2026-05-04, Slight Chance T-storms. A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. Southwest wind 14 to 17 mph, with gusts as high as 25 mph.Tonight 2026-05-04, Slight Chance T-storms then T-storms Likely. Showers and thunderstorms likely, mainly between 3am and 4am, then showers likely and possibly a thunderstorm after 4am. Increasing clouds, with a low around 57. South wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Tuesday 2026-05-05, Showers. Showers and possibly a thunderstorm before 7am, then showers between 7am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 63. South wind 6 to 13 mph becoming north in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 100%.
Tuesday Night 2026-05-05, Showers. Showers and possibly a thunderstorm. Low around 46. North wind 7 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Wednesday 2026-05-06, Chance Showers. A 30 percent chance of showers, mainly before 1pm. Partly sunny, with a high near 60. North wind 6 to 9 mph.
Wednesday Night 2026-05-06, Slight Chance Showers. A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 44.- Thursday 2026-05-07, Mostly Sunny. Mostly sunny, with a high near 64.
Thursday Night 2026-05-07, Mostly Clear. Mostly clear, with a low around 47.- Friday 2026-05-08, Mostly Sunny. Mostly sunny, with a high near 72.
Friday Night 2026-05-08, Chance Showers. A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 51.
Saturday 2026-05-09, Sunny. Sunny, with a high near 74.Saturday Night 2026-05-09, Partly Cloudy then Slight Chance Showers. A 20 percent chance of showers. Partly cloudy, with a low around 53.
Sunday 2026-05-10, Chance Showers. A 40 percent chance of showers. Mostly sunny, with a high near 73.