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St Clair Regional, MO Weather Forecast
St Clair Regional, MO Weather Forecast Date: 413 PM CDT Tue Sep 29 2026
The area/counties/county of: Gasconade County Mo, including the cities of: Washington, Union, and Sullivan.or toggle through each period.
Tonight... Mostly cloudy. Not as cool with lows in the upper 60s. South winds around 5 mph.
Wednesday... Partly sunny. Highs in the upper 80s. South winds 5 to 10 mph with gusts up to 25 mph.
Wednesday Night... Mostly cloudy. Lows in the lower 70s. South winds 5 to 10 mph with gusts up to 20 mph.
Thursday... Mostly cloudy. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. South winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50%.
Thursday Night... Cloudy with a slight chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Lows in the mid 60s. Southwest winds around 5 mph, becoming west after midnight. Chance of rain 90%.
Friday... A slight chance of thunderstorms. Showers, mainly in the morning. Cooler with highs in the lower 70s. Chance of rain 90%.
Friday Night... Mostly cloudy with a 20% chance of showers. Cooler with lows in the mid 50s.
Saturday... Partly sunny with a 30% chance of showers. Highs in the upper 60s.
Saturday Night... Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 50s.
Sunday... Mostly clear. Highs in the upper 60s. Lows in the upper 40s.
Monday... Mostly clear. Highs in the upper 60s. Lows in the upper 40s.
Monday Night... Clear. Lows in the upper 40s.
POP = Probability of Precipitation
St Clair Regional Radar Loop
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