Washington County, MO Weather Forecast
County weather hub
Slight Chance Showers And Thunderstorms
Compare major city weather across Washington County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A slight chance of showers and thunderstorms after 7am. Sunny, with a high near 92. Chance of precipitation is 20%.
County Weather Overview
This county weather page brings together forecast coverage for Washington County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 1 of 1 mapped cities in Washington County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 18 to Jul 20, 2026
- Latest sync
- Jul 14, 2026 6:51 AM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Washington County
Saturday looks like the warmest upcoming period in Washington County at 92 degrees F.
Sunday Night is the coolest period ahead with temperatures near 71 degrees F.
The strongest winds are forecast for Saturday at about 3 to 7 mph W.
Precipitation is mentioned in 4 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 6:51 AM CDT
- Coverage
- 3 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 73. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 92. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 1am. Mostly clear, with a low around 71. Chance of precipitation is 20%.
Sunny, with a high near 92.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Slight Chance Showers And Thunderstorms
|
92°F |
3 to 7 mph
W
|
|
Saturday Night
Jul 18
|
Slight Chance Showers And Thunderstorms then Mostly Clear
|
73°F |
3 mph
SW
|
|
Sunday
Jul 19
|
Sunny then Slight Chance Showers And Thunderstorms
|
92°F |
6 mph
W
|
|
Sunday Night
Jul 19
|
Slight Chance Showers And Thunderstorms
|
71°F |
1 to 5 mph
W
|
|
Monday
Jul 20
|
Sunny
|
92°F |
2 to 6 mph
W
|
Major City Forecasts
Live forecast snapshots for major cities across Washington County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Washington County.
Largest mapped city population in this region: 2,548.
