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

Albertus Airport (KFEP)

Lat: 42.25°NLon: 89.58°WElev: 837ft.

Overcast

64°F

18°C

Humidity 95%
Wind Speed NE 17 mph
Barometer 29.92 in
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 20 Sep 5:35 am CDT
Extended Forecast for

Freeport IL

Flood Watch September 20, 05:52am until September 20, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 20, 05:52am until September 20, 01:00pm

    NOW until 1:00pm Sun

    Flood Watch

  • Overnight

    Low: 64 °F

    Heavy Rain
    and Patchy
    Fog

  • Sunday

    Sunday: Occasional showers and thunderstorms before 11am, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog before 9am. Steady temperature around 63. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    High: 63 °F

    Heavy Rain
    and Patchy
    Fog then
    Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers, mainly between midnight and 5am. Mostly cloudy, with a low around 54. Northeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 54 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers before 4pm, then a slight chance of showers after 5pm. Cloudy, with a high near 63. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 63 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

Detailed Forecast

Overnight
Occasional showers and thunderstorms. Some of the storms could produce heavy rainfall. Patchy fog. Steady temperature around 64. Northeast wind around 10 mph. Chance of precipitation is 90%.
Sunday
Occasional showers and thunderstorms before 11am, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog before 9am. Steady temperature around 63. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Sunday Night
A 30 percent chance of showers, mainly between midnight and 5am. Mostly cloudy, with a low around 54. Northeast wind around 15 mph, with gusts as high as 25 mph.
Monday
A chance of showers before 4pm, then a slight chance of showers after 5pm. Cloudy, with a high near 63. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Monday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 49.
Tuesday
Partly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Partly cloudy, with a low around 47.
Thursday
Mostly sunny, with a high near 65.
Thursday Night
Mostly cloudy, with a low around 49.
Friday
Partly sunny, with a high near 67.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Partly sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Freeport IL
 42.3°N 89.65°W (Elev. 850 ft)
Last Update:
4:31 am CDT Sep 20, 2026
Forecast Valid:
5am CDT Sep 20, 2026-6pm CDT Sep 26, 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