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Excessive Rainfall Potential for the Southeast; Heat Expands for Center of the Nation; Critical Fire Weather for Pacific Northwest

Flash flooding threatens areas from the Tennessee Valley to the Carolinas as storms repeat along a stalled front. Monsoonal storms may trigger flooding in the Southwest. Dangerous heat expands across the Desert Southwest, Plains, mid-Mississippi Valley and Southern Tier. Critical fire weather for interior Pacific Northwest. Cooler, drier air brings brief relief to the Great Lakes and Northeast. Read More >

Hazardous Weather Conditions

Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Overcast

66°F

19°C

Humidity 84%
Wind Speed SW 10 mph
Barometer 30.07 in (1017.7 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 25 Jul 1:54 am CDT
Extended Forecast for

4 Miles SW Forsyth IL

Heat Advisory July 26, 12:00pm until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 65. South wind around 5 mph.

    Low: 65 °F

    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 81. South wind 5 to 8 mph.

    High: 81 °F

    Chance
    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 69. South southeast wind 3 to 5 mph.

    Low: 69 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 91. Heat index values as high as 103. Light and variable wind becoming southwest 5 to 8 mph in the afternoon.

    High: 91 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73. South wind 5 to 8 mph.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 95. Southwest wind 9 to 16 mph, with gusts as high as 23 mph.

    High: 95 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. Southwest wind 8 to 13 mph becoming west northwest after midnight. Winds could gust as high as 18 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 65. South wind around 5 mph.
Saturday
A 50 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 81. South wind 5 to 8 mph.
Saturday Night
Mostly cloudy, with a low around 69. South southeast wind 3 to 5 mph.
Sunday
Partly sunny, with a high near 91. Heat index values as high as 103. Light and variable wind becoming southwest 5 to 8 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 73. South wind 5 to 8 mph.
Monday
Mostly sunny and hot, with a high near 95. Southwest wind 9 to 16 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 74. Southwest wind 8 to 13 mph becoming west northwest after midnight. Winds could gust as high as 18 mph.
Tuesday
Mostly sunny, with a high near 90.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 66.
Thursday
Sunny, with a high near 88.
Thursday Night
Partly cloudy, with a low around 68.
Friday
Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Forsyth IL
 39.89°N 89°W (Elev. 659 ft)
Last Update:
1:26 am CDT Jul 25, 2026
Forecast Valid:
2am CDT Jul 25, 2026-6pm CDT Jul 31, 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