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

Heat in the Central U.S.; Heavy Rain Possible for South Texas; Monitoring Erin Tropical Impacts

Hot temperatures are forecast over the Plains and into the lower Mississippi River Valley Friday where Heat Advisories have been issued. Heavy rain from a disturbance in the western Gulf could bring flooding to south Texas. Erin could bring tropical storm conditions and heavy rain to Puerto Rico and the USVI this weekend with dangerous surf and rip currents impacting the western Atlantic Basin. Read More >

Hazardous Weather Conditions

Current conditions at

Jacksonville Municipal Airport (KIJX)

Lat: 39.77°NLon: 90.24°WElev: 614ft.

Fair

70°F

21°C

Humidity 98%
Wind Speed SE 3 mph
Barometer 30.06 in
Dewpoint 69°F (21°C)
Visibility 7.00 mi
Last update 15 Aug 5:50 am CDT
Extended Forecast for

Chapin IL

  • Today

    Today: Sunny, with a high near 92. Heat index values as high as 101. Light and variable wind becoming south around 6 mph in the morning.

    High: 92 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 73. South southeast wind 3 to 6 mph.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Heat index values as high as 103. South wind around 6 mph.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. Light south wind.

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 95. Light south southwest wind.

    High: 95 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. Light south southeast wind.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 95. South southwest wind 3 to 6 mph.

    High: 95 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 92. Heat index values as high as 101. Light and variable wind becoming south around 6 mph in the morning.
Tonight
Mostly clear, with a low around 73. South southeast wind 3 to 6 mph.
Saturday
Sunny, with a high near 94. Heat index values as high as 103. South wind around 6 mph.
Saturday Night
Mostly clear, with a low around 74. Light south wind.
Sunday
Sunny and hot, with a high near 95. Light south southwest wind.
Sunday Night
Mostly clear, with a low around 74. Light south southeast wind.
Monday
Sunny and hot, with a high near 95. South southwest wind 3 to 6 mph.
Monday Night
Mostly clear, with a low around 74.
Tuesday
Mostly sunny, with a high near 92.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chapin IL
 39.77°N 90.41°W (Elev. 627 ft)
Last Update:
5:41 am CDT Aug 15, 2025
Forecast Valid:
6am CDT Aug 15, 2025-6pm CDT Aug 21, 2025
 
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