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August 11, 2026: Powerful Morning Derecho Produces Widespread Wind Damage and Tornadoes Across Northern Illinois and Northwest Indiana

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

75°F

24°C

Humidity	47%
Wind Speed	NE 5 mph
Barometer	30.09 in
Dewpoint	54°F (12°C)
Visibility	10.00 mi
Last update	20 Aug 12:45 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Roscoe IL

This Afternoon
High: 80 °F
Sunny
Tonight
Low: 58 °F
Partly Cloudy
Friday
High: 80 °F
Chance
Showers then
T-storms
Likely
Friday Night
Low: 59 °F
T-storms
Likely then
Partly Cloudy
Saturday
High: 78 °F
Sunny
Saturday Night
Low: 55 °F
Mostly Clear
Sunday
High: 76 °F
Sunny
Sunday Night
Low: 53 °F
Partly Cloudy
Monday
High: 77 °F
Mostly Sunny

Detailed Forecast

This Afternoon

Sunny, with a high near 80. Calm wind.

Tonight

Partly cloudy, with a low around 58. Calm wind becoming south around 5 mph.

Friday

A slight chance of showers, then showers and thunderstorms likely after 11am. Partly sunny, with a high near 80. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 59. South southwest wind around 5 mph becoming northwest after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 60%.

Saturday

Sunny, with a high near 78. Northwest wind 5 to 15 mph, with gusts as high as 20 mph.

Saturday Night

Mostly clear, with a low around 55.

Sunday

Sunny, with a high near 76.

Sunday Night

Partly cloudy, with a low around 53.

Monday

Mostly sunny, with a high near 77.

Monday Night

Partly cloudy, with a low around 56.