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

Excessive Rainfall and Significant Flooding in the Upper Midwest This Weekend

Heavy to excessive rainfall is expected over the weekend across eastern Iowa, northern Missouri, northwest Illinois and southern Wisconsin. Numerous flash floods, some with significant impacts, are expected in these areas. Heaviest rainfall will occur overnight Saturday and Sunday, so be sure to have multiple ways to receive warnings. Read More >

Current conditions at

Galesburg Municipal Airport (KGBG)

Lat: 40.93°NLon: 90.43°WElev: 751ft.

Fair

76°F

24°C

Humidity 80%
Wind Speed S 7 mph
Barometer 29.98 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 9 Aug 12:55 am CDT
Extended Forecast for

Altona IL

  • Overnight

    Overnight: Mostly clear, with a low around 74. South wind 11 to 13 mph, with gusts as high as 22 mph.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. Heat index values as high as 101. South wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 91 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southeast wind around 11 mph, with gusts as high as 18 mph.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 85. South wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 85 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. South wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.

    Low: 71 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: A chance of showers, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 83. Southwest wind 6 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 83 °F

    Chance
    Showers then
    T-storms
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 68 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 74. South wind 11 to 13 mph, with gusts as high as 22 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. Heat index values as high as 101. South wind 11 to 14 mph, with gusts as high as 24 mph.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southeast wind around 11 mph, with gusts as high as 18 mph.
Sunday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 85. South wind around 10 mph, with gusts as high as 17 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. South wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts between three quarters and one inch possible.
Monday
A chance of showers, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 83. Southwest wind 6 to 9 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 67.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
A chance of showers. Mostly sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 69.
Friday
Sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Altona IL
 41.11°N 90.17°W (Elev. 725 ft)
Last Update:
12:56 am CDT Aug 9, 2025
Forecast Valid:
1am CDT Aug 9, 2025-6pm CDT Aug 15, 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