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Washington County, MO Weather Forecast
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Washington County Weather Forecast
| REST OF TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
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| Thunderstorms | Chance of T-Storm | Chance of T-Storm | Clearing | Sunny | Mostly Clear | Mostly Clear | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm |
| Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C |
| POP: 20% | POP: 50% | POP: 40% | POP: 40% | POP: 40% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 908 AM CDT Tue Sep 15 2026 
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Issued: 627 AM CDT Tue Sep 15 2026
Key Messages
- Unseasonably hot and humid weather continues this week with heat index values reaching 105F+ along and south of I-70 today.
- Scattered showers and thunderstorms (30-70%) are forecast today and tonight, with the main threats being localized damaging winds and heavy rainfall.
Aviation
/12Z TAFS THROUGH 18Z WEDNESDAY/... Issued at 626 AM CDT Tue Sep 15 2026
A cold front will slowly push southward across the region later today, possibly stalling across the area tonight. As it approaches, sho...