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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Marshall County Airport (KC75)

Lat: 41.02°NLon: 89.39°WElev: 545ft.

Heavy Rain

67°F

19°C

Humidity 90%
Wind Speed E 6 mph
Barometer 30.22 in
Dewpoint 64°F (18°C)
Visibility 1.75 mi
Last update 18 Sep 1:35 pm CDT
Extended Forecast for

Granville IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers, mainly before 2pm. Mostly sunny, with a high near 75. East wind around 10 mph.

    High: 75 °F

    Chance
    Showers

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. East wind around 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 82. East wind 5 to 10 mph becoming south in the afternoon. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely before 11pm, then showers likely and possibly a thunderstorm between 11pm and 4am, then showers likely after 4am. Mostly cloudy, with a low around 66. Northwest wind around 5 mph becoming southwest in the evening. Chance of precipitation is 70%.

    Low: 66 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers. High near 73. Chance of precipitation is 80%.

    High: 73 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely. Mostly cloudy, with a low around 58. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 58 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.

    High: 66 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers, mainly before 2pm. Mostly sunny, with a high near 75. East wind around 10 mph.
Tonight
A 50 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. East wind around 10 mph, with gusts as high as 20 mph.
Saturday
Showers and thunderstorms likely before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 82. East wind 5 to 10 mph becoming south in the afternoon. Chance of precipitation is 70%.
Saturday Night
Showers and thunderstorms likely before 11pm, then showers likely and possibly a thunderstorm between 11pm and 4am, then showers likely after 4am. Mostly cloudy, with a low around 66. Northwest wind around 5 mph becoming southwest in the evening. Chance of precipitation is 70%.
Sunday
Showers. High near 73. Chance of precipitation is 80%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 58. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 53.
Tuesday
Partly sunny, with a high near 64.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
Partly sunny, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granville IL
 41.26°N 89.24°W (Elev. 699 ft)
Last Update:
1:27 pm CDT Sep 18, 2026
Forecast Valid:
1pm CDT Sep 18, 2026-6pm CDT Sep 24, 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