| NWS Forecast for: Washington County Issued by: National Weather Service Saint Louis, MO Last Update: 538 PM CDT Wed Jul 1 2026 |  |
Tonight: Clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 100 early this evening. Thursday: Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106. Thursday Night: Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 105 early in the evening. Friday: Sunny with highs in the mid 90s. South winds around 5 mph. Heat index values up to 105. Friday Night: Partly cloudy in the evening, then becoming mostly clear. Humid with lows in the mid 70s. South winds around 5 mph in the evening, becoming light and variable. Heat index values up to 105 early in the evening. Independence Day: Sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 105. Saturday Night: Partly cloudy in the evening, then becoming mostly clear. A slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. Sunday: Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 40 percent. Heat index values up to 105. Sunday Night: Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. Monday Through Tuesday: Partly cloudy with a chance of showers and thunderstorms. Highs in the lower 90s. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 100. Tuesday Night: Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent. Wednesday: Mostly sunny with a chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs around 90. Chance of rain 40 percent. Heat index values up to 100. | |
| Zone Forecast: Washington County | |
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