I-55 weather conditions near Herculaneum, Missouri
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Seasoned Weather Conditions
Current Weather Conditions
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7 day weather forecast
Current condition: Overcast 72°F 2025-09-23T19:53:00-05:00 
Tonight 2025-09-23, Heavy Rain and Patchy Fog. Showers and thunderstorms likely. Some of the storms could produce heavy rainfall. Patchy fog after midnight. Otherwise, cloudy, with a low around 64. East wind 3 to 5 mph. Chance of precipitation is 60%.
Wednesday 2025-09-24, Showers Likely and Patchy Fog. Scattered showers before 1pm, then scattered showers and thunderstorms between 1pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Patchy fog before 10am. Otherwise, cloudy, with a high near 73. North wind 3 to 6 mph. Chance of precipitation is 60%.- Wednesday Night 2025-09-24, Showers Likely. Showers and thunderstorms likely before 1am, then a chance of showers. Mostly cloudy, with a low around 59. North wind 3 to 6 mph. Chance of precipitation is 60%.
Thursday 2025-09-25, Slight Chance Showers then Mostly Sunny. A 20 percent chance of showers before 10am. Mostly sunny, with a high near 77. North wind 3 to 7 mph.
Thursday Night 2025-09-25, Mostly Clear. Mostly clear, with a low around 53. Light west wind.
Friday 2025-09-26, Sunny. Sunny, with a high near 81.
Friday Night 2025-09-26, Clear. Clear, with a low around 52.
Saturday 2025-09-27, Sunny. Sunny, with a high near 84.- Saturday Night 2025-09-27, Clear. Clear, with a low around 55.
- Sunday 2025-09-28, Sunny. Sunny, with a high near 85.
- Sunday Night 2025-09-28, Mostly Clear. Mostly clear, with a low around 56.
- Monday 2025-09-29, Sunny. Sunny, with a high near 85.
Monday Night 2025-09-29, Partly Cloudy. Partly cloudy, with a low around 57.
Tuesday 2025-09-30, Mostly Sunny. Mostly sunny, with a high near 84.