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

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Light Rain

68°F

20°C

Humidity 94%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 20 Sep 5:40 am CDT
Extended Forecast for

Peru IL

Flood Watch September 20, 05:57am until September 20, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 20, 05:57am until September 20, 01:00pm

    NOW until 1:00pm Sun

    Flood Watch

  • Overnight

    Low: 68 °F

    Heavy Rain
    and Patchy
    Fog

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 3pm, then a chance of showers and thunderstorms between 3pm and 4pm, then a chance of showers after 4pm. Some of the storms could produce heavy rainfall. Patchy fog before 10am. High near 71. Northeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 71 °F

    Heavy Rain
    and Patchy
    Fog then
    Showers

  • Sunday Night

    Sunday Night: A slight chance of showers before 7pm, then a chance of showers after 11pm. Cloudy, with a low around 59. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 59 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers, mainly before 10am. Mostly cloudy, with a high near 66. East northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 55. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 55 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 64.

    High: 64 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 67.

    High: 67 °F

    Mostly Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Patchy fog. Low around 68. East northeast wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers and possibly a thunderstorm before 3pm, then a chance of showers and thunderstorms between 3pm and 4pm, then a chance of showers after 4pm. Some of the storms could produce heavy rainfall. Patchy fog before 10am. High near 71. Northeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
A slight chance of showers before 7pm, then a chance of showers after 11pm. Cloudy, with a low around 59. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Monday
A 30 percent chance of showers, mainly before 10am. Mostly cloudy, with a high near 66. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 55. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 64.
Tuesday Night
Partly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 67.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Mostly sunny, with a high near 68.
Thursday Night
Mostly cloudy, with a low around 52.
Friday
Partly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 50.
Saturday
Partly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Peru IL
 41.34°N 89.11°W
Last Update:
3:36 am CDT Sep 20, 2026
Forecast Valid:
5am CDT Sep 20, 2026-6pm CDT Sep 26, 2026
 
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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