| NWS Forecast for: Jefferson County Issued by: National Weather Service Saint Louis, MO Last Update: 418 AM CDT Mon Jun 15 2026 |  |
| Today: Sunny. Highs in the upper 70s. Northwest winds around 5 mph. Tonight: Mostly clear. Lows in the mid 50s. West winds around 5 mph, becoming southwest after midnight. Tuesday: Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Southwest winds 5 to 10 mph. Chance of rain 40 percent. Tuesday Night: Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the upper 50s. West winds 5 to 10 mph in the evening, becoming light and variable. Chance of rain 20 percent. Wednesday: Sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. South winds 5 to 10 mph with gusts up to 20 mph, increasing to 15 to 20 mph with gusts up to 35 mph in the afternoon. Chance of rain 20 percent. Wednesday Night: Showers. A chance of thunderstorms, mainly in the evening. Not as cool with lows around 70. Chance of rain 90 percent. Thursday: Becoming partly sunny in the afternoon. A slight chance of thunderstorms. Showers likely, mainly in the morning. Highs around 80. Chance of rain 70 percent. Thursday Night: Partly cloudy in the evening, then clearing. A 20 percent chance of showers. Cooler with lows in the upper 50s. Juneteenth And Friday Night: Mostly clear. Highs in the lower 80s. Lows around 60. Saturday: Mostly sunny. Highs in the mid 80s. Saturday Night: Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 60s. Chance of rain 30 percent. Sunday: Partly sunny in the morning, then becoming mostly cloudy. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent. | |
| Zone Forecast: Jefferson County | |
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