National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Hazardous Weather Conditions

Current conditions at

Washington Regional Airport (KFYG)

Lat: 38.59°NLon: 90.99°WElev: 489ft.

Fair

73°F

23°C

Humidity 100%
Wind Speed Calm
Barometer 30.19 in
Dewpoint 73°F (23°C)
Visibility 7.00 mi
Last update 17 Sep 3:55 am CDT
Extended Forecast for

Olney MO

Heat Advisory September 17, 04:16am until September 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 17, 04:16am until September 18, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 94 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 70. Calm wind becoming west around 5 mph.

    Low: 70 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92. Heat index values as high as 102. East wind around 5 mph becoming calm in the afternoon.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 71. Light south wind.

    Low: 71 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 93. Southwest wind 3 to 8 mph.

    High: 93 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 30%.

    High: 87 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 94. Heat index values as high as 105. West wind 3 to 8 mph. Winds could gust as high as 21 mph.
Tonight
Mostly clear, with a low around 70. Calm wind becoming west around 5 mph.
Friday
Sunny, with a high near 92. Heat index values as high as 102. East wind around 5 mph becoming calm in the afternoon.
Friday Night
Mostly clear, with a low around 71. Light south wind.
Saturday
Mostly sunny, with a high near 93. Southwest wind 3 to 8 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 69.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 87. Chance of precipitation is 30%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Monday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 59.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 75.
Tuesday Night
Partly cloudy, with a low around 57.
Wednesday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Olney MO
 39.07°N 91.24°W (Elev. 636 ft)
Last Update:
2:31 am CDT Sep 17, 2026
Forecast Valid:
4am CDT Sep 17, 2026-6pm CDT Sep 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation