Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Pontiac Municipal Airport (KPNT)

Lat: 40.92°NLon: 88.62°WElev: 650ft.

Overcast

69°F

21°C

Humidity 100%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 19 Aug 5:35 am CDT
Extended Forecast for

2 Miles SSW Graymont IL

Flood Watch August 19, 01:00pm until August 20, 01:00am
Click here for hazard details and duration
Flood Watch
  • Today

    Today: A slight chance of showers between noon and 1pm, then a chance of showers and thunderstorms after 1pm.  Patchy fog before 8am.  Otherwise, mostly cloudy, with a high near 80. Calm wind becoming northwest around 5 mph.  Chance of precipitation is 30%.

    High: 80 °F

    Patchy Fog
    then Chance
    Showers

  • Tonight

    Tonight: A 20 percent chance of showers before 10pm.  Mostly cloudy, with a low around 62. Northeast wind around 5 mph.

    Low: 62 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 80. North northeast wind around 5 mph becoming calm  in the afternoon.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the morning. Winds could gust as high as 15 mph.

    High: 80 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms.  Sunny, with a high near 80.

    High: 80 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 80. Calm wind becoming northwest around 5 mph. Chance of precipitation is 30%.
Tonight
A 20 percent chance of showers before 10pm. Mostly cloudy, with a low around 62. Northeast wind around 5 mph.
Thursday
Sunny, with a high near 80. North northeast wind around 5 mph becoming calm in the afternoon.
Thursday Night
Mostly clear, with a low around 61. Calm wind.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the morning. Winds could gust as high as 15 mph.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64.
Saturday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 59.
Monday
Mostly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 81.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Graymont IL
 40.87°N 88.76°W
3:46 am CDT Aug 19, 2026
5am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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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