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

Davenport Municipal Airport (KDVN)

Lat: 41.61°NLon: 90.59°WElev: 741ft.

Overcast

65°F

18°C

Humidity 93%
Wind Speed NE 12 G 21 mph
Barometer 29.98 in (1014.5 mb)
Dewpoint 63°F (17°C)
Visibility 8.00 mi
Last update 20 Sep 12:52 pm CDT
Extended Forecast for

Port Byron IL

  • This Afternoon

    This Afternoon: A 50 percent chance of showers between 3pm and 4pm. Mostly cloudy, with a high near 68. Northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 68 °F

    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers before 7pm, then a chance of showers after 10pm. Cloudy, with a low around 58. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 58 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers after 3pm. Cloudy, with a high near 64. Northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 50 percent chance of showers, mainly after 7pm. Mostly cloudy, with a low around 54. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 54 °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 49.

    Low: 49 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 65.

    High: 65 °F

    Mostly Sunny

  • Wednesday Night

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

    Low: 50 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 50 percent chance of showers between 3pm and 4pm. Mostly cloudy, with a high near 68. Northeast wind around 15 mph, with gusts as high as 25 mph.
Tonight
A slight chance of showers before 7pm, then a chance of showers after 10pm. Cloudy, with a low around 58. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Monday
A 40 percent chance of showers after 3pm. Cloudy, with a high near 64. Northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
A 50 percent chance of showers, mainly after 7pm. Mostly cloudy, with a low around 54. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Partly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 49.
Wednesday
Mostly sunny, with a high near 65.
Wednesday Night
Partly cloudy, with a low around 50.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 52.
Friday
Partly sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 51.
Saturday
Partly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Port Byron IL
 41.62°N 90.33°W (Elev. 627 ft)
Last Update:
9:31 am CDT Sep 20, 2026
Forecast Valid:
12pm 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