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

Areas of Fire Weather and Severe Thunderstorms through the Weekend

Dry, windy conditions will bring elevated to critical fire risks to the northern Plains today, and southern High Plains and the Southwest through the weekend. Severe thunderstorms capable of large to very large hail, wind damage and tornadoes will be possible today and Saturday across parts of the central Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Sterling Rockfalls (KSQI)

Lat: 41.74°NLon: 89.67°WElev: 643ft.

Fair

58°F

14°C

Humidity 65%
Wind Speed Vrbl 7 mph
Barometer 29.90 in (1012.2 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 15 May 6:56 am CDT
Extended Forecast for

Lyndon IL

  • Today

    Today: Mostly sunny, with a high near 79. South wind around 15 mph, with gusts as high as 25 mph.

    High: 79 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 4am, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 60. South wind 5 to 15 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

    Low: 60 °F

    Mostly Clear
    then T-storms
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms before noon, then a chance of showers between noon and 1pm, then a slight chance of showers and thunderstorms after 1pm. Cloudy through mid morning, then gradual clearing, with a high near 85. Southwest wind around 5 mph. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 7pm, then showers likely and possibly a thunderstorm between 7pm and 4am, then showers likely after 4am. Mostly cloudy, with a low around 60. Southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 60 °F

    Showers
    Likely

  • Sunday

    Sunday: Mostly sunny, with a high near 87. Breezy.

    High: 87 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 66. Breezy.

    Low: 66 °F

    Mostly Clear
    and Breezy
    then Chance
    T-storms

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 87. Breezy. Chance of precipitation is 80%.

    High: 87 °F

    Showers and
    Breezy

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 65. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly after 1pm. Partly sunny, with a high near 83. Breezy. Chance of precipitation is 60%.

    High: 83 °F

    Breezy.
    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

Today
Mostly sunny, with a high near 79. South wind around 15 mph, with gusts as high as 25 mph.
Tonight
Showers and thunderstorms likely, mainly before 4am, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 60. South wind 5 to 15 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.
Saturday
A chance of showers and thunderstorms before noon, then a chance of showers between noon and 1pm, then a slight chance of showers and thunderstorms after 1pm. Cloudy through mid morning, then gradual clearing, with a high near 85. Southwest wind around 5 mph. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms before 7pm, then showers likely and possibly a thunderstorm between 7pm and 4am, then showers likely after 4am. Mostly cloudy, with a low around 60. Southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Mostly sunny, with a high near 87. Breezy.
Sunday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 66. Breezy.
Monday
Showers and possibly a thunderstorm. High near 87. Breezy. Chance of precipitation is 80%.
Monday Night
Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 65. Chance of precipitation is 60%.
Tuesday
Showers likely, mainly after 1pm. Partly sunny, with a high near 83. Breezy. Chance of precipitation is 60%.
Tuesday Night
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 52.
Wednesday
Mostly sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 47.
Thursday
Partly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lyndon IL
 41.72°N 89.91°W (Elev. 600 ft)
Last Update:
3:01 am CDT May 15, 2026
Forecast Valid:
7am CDT May 15, 2026-6pm CDT May 21, 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