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

Rockford, Greater Rockford Airport (KRFD)

Lat: 42.19°NLon: 89.09°WElev: 735ft.

Overcast

68°F

20°C

Humidity 65%
Wind Speed E 8 mph
Barometer 30.15 in (1020.5 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 18 Sep 3:54 pm CDT
Extended Forecast for

Belvidere IL

Flood Watch September 19, 01:00am until September 19, 01:00pm
Click here for hazard details and duration
Flood Watch

  • This Afternoon

    This Afternoon: A 30 percent chance of showers, mainly before 5pm. Mostly cloudy, with a high near 71. East wind around 15 mph, with gusts as high as 20 mph.

    High: 71 °F

    Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly after 4am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 61. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 61 °F

    Slight Chance
    Showers then
    Heavy Rain

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 11am, then showers and thunderstorms likely, mainly between 11am and noon. Some of the storms could produce heavy rainfall. High near 76. East southeast wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 76 °F

    Heavy Rain
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 62. East southeast wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 80%.

    Low: 62 °F

    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 67. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    High: 67 °F

    Showers
    Likely

  • Sunday Night

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

    Low: 53 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers. Cloudy, with a high near 64.

    High: 64 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers after 1am. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
A 30 percent chance of showers, mainly before 5pm. Mostly cloudy, with a high near 71. East wind around 15 mph, with gusts as high as 20 mph.
Tonight
Showers and thunderstorms likely, mainly after 4am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 61. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers and possibly a thunderstorm before 11am, then showers and thunderstorms likely, mainly between 11am and noon. Some of the storms could produce heavy rainfall. High near 76. East southeast wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Saturday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 62. East southeast wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 80%.
Sunday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers. Mostly cloudy, with a high near 67. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Sunday Night
A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 53.
Monday
A 40 percent chance of showers. Cloudy, with a high near 64.
Monday Night
A chance of showers after 1am. Mostly cloudy, with a low around 48.
Tuesday
Mostly cloudy, with a high near 62.
Tuesday Night
Mostly cloudy, with a low around 47.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 48.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 49.
Friday
Mostly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Belvidere IL
 42.25°N 88.86°W
Last Update:
2:51 pm CDT Sep 18, 2026
Forecast Valid:
4pm CDT Sep 18, 2026-6pm CDT Sep 25, 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