| NWS Forecast for: Jefferson County Issued by: National Weather Service Saint Louis, MO Last Update: 923 AM CDT Tue Oct 13 2026 |  |
| Rest Of Today: Sunny. Highs in the lower 90s. Southwest winds 5 to 10 mph. Tonight: Mostly clear in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Wednesday: Showers with a chance of thunderstorms. Cooler with highs in the lower 80s. West winds around 5 mph. Chance of rain near 100 percent. Wednesday Night: Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the evening, then showers with a chance of thunderstorms after midnight. Lows in the mid 60s. Northeast winds around 5 mph in the evening, becoming light and variable. Chance of rain 80 percent. Thursday: Showers with a chance of thunderstorms in the morning, then showers likely with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. South winds around 5 mph, becoming southwest in the afternoon. Chance of rain 90 percent. Thursday Night: Partly cloudy with a chance of showers with a slight chance of thunderstorms in the evening, then mostly cloudy with a slight chance of showers after midnight. Much cooler with lows around 50. Chance of rain 50 percent. Friday: Mostly sunny. Much cooler with highs in the lower 60s. Friday Night Through Saturday Night: Mostly clear. Lows in the upper 30s. Highs in the lower 60s. Sunday: Sunny. Highs in the lower 70s. Sunday Night And Monday: Partly cloudy. Lows in the mid 40s. Highs in the mid 70s. | |
| Zone Forecast: Jefferson County | |
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