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

Fort Madison Municipal Airport (KFSW)

Lat: 40.66°NLon: 91.33°WElev: 719ft.

Thunderstorm in Vicinity Drizzle and Breezy

70°F

21°C

Humidity 94%
Wind Speed NW 22 G 28 mph
Barometer 29.94 in
Dewpoint 68°F (20°C)
Visibility 8.00 mi
Last update 19 Aug 4:55 pm CDT
Extended Forecast for

Pontoosuc IL

  • This Afternoon

    This Afternoon: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 81. Northeast wind around 5 mph.

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 9pm, then a slight chance of showers between 9pm and midnight.  Patchy fog after 5am.  Otherwise, mostly cloudy, with a low around 68. North wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 68 °F

    T-storms
    Likely then
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am.  Otherwise, mostly sunny, with a high near 81. Northeast wind around 5 mph.

    High: 81 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Northeast wind around 5 mph.
Tonight
Showers and thunderstorms likely before 9pm, then a slight chance of showers between 9pm and midnight. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 68. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 81. Northeast wind around 5 mph.
Thursday Night
Mostly clear, with a low around 68. Calm wind.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 69.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Mostly cloudy, with a low around 65.
Monday
Mostly sunny, with a high near 80.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 83.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 83.
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ABOUT THIS FORECAST

 
Point Forecast:
Pontoosuc IL
 40.63°N 91.21°W (Elev. 531 ft)
4:01 pm CDT Aug 19, 2026
5pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database