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St. Thomas, MO Weather Forecast
St. Thomas, MO Weather Forecast Date: 927 PM CDT Mon Sep 07 2026
The area/counties/county of: Boone County Mo, including the cities of: Columbia and Jefferson City.or toggle through each period.
Tonight... Mostly clear. Lows in the upper 60s. Southeast winds 5 to 10 mph.
Tuesday... Mostly sunny. Warmer with highs around 99. South winds around 5 mph. Heat index values up to 106 in the afternoon.
Tuesday Night... Mostly clear. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 104 early in the evening.
Wednesday... Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph, becoming west in the afternoon. Chance of rain 70%. Heat index values up to 106.
Wednesday Night... Showers with a chance of thunderstorms. Humid with lows in the upper 60s. Northwest winds around 5 mph. Chance of rain near 100%.
Thursday... Mostly cloudy with a chance of showers and thunderstorms in the morning, then mostly sunny with a slight chance of showers and thunderstorms in the afternoon. Cooler with highs in the lower 80s. Chance of rain 50%.
Thursday Night... Partly cloudy in the evening, then mostly clear with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20%.
Friday... Mostly sunny with a chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40%.
Friday Night... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the upper 60s. Highs in the upper 80s. Chance of rain 50%.
Saturday... Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the upper 60s. Highs in the upper 80s. Chance of rain 50%.
Saturday Night... Mostly clear with a 20% chance of showers. Lows in the mid 60s.
Sunday... Mostly clear. A slight chance of showers and thunderstorms. Highs in the upper 80s. Lows in the mid 60s. Chance of rain 20%.
Sunday Night... Mostly clear. A slight chance of showers and thunderstorms. Highs in the upper 80s. Lows in the mid 60s. Chance of rain 20%.
POP = Probability of Precipitation
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