| NWS Forecast for: Lewis County Issued by: National Weather Service Saint Louis, MO Last Update: 1223 PM CDT Sat Sep 5 2026 |  |
This Afternoon: Sunny, hot. Near steady temperature in the mid 90s. North winds around 5 mph. Heat index values up to 106. Tonight: Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the upper 60s. Northeast winds around 5 mph. Heat index values up to 103 early in the evening. Sunday: Mostly sunny. Highs around 90. East winds 5 to 10 mph. Sunday Night: Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 60s. East winds 5 to 10 mph. Labor Day: Sunny. Highs in the upper 80s. Southeast winds 5 to 10 mph. Monday Night: Mostly clear. Lows in the upper 60s. Tuesday: Mostly sunny. Hot with highs in the mid 90s. Tuesday Night: Mostly clear. Lows in the mid 70s. Wednesday: Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. Chance of rain 20 percent. Wednesday Night: Partly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the upper 60s. Chance of rain 50 percent. Thursday: Mostly sunny. A chance of showers in the morning. Highs in the mid 80s. Chance of rain 50 percent. Thursday Night: Mostly clear. A slight chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 20 percent. Friday: Mostly sunny. A chance of showers in the morning. Highs in the upper 80s. Chance of rain 30 percent. | |
| Zone Forecast: Lewis County | |
Visit your local NWS office at: https://www.weather.gov/lsx/ |