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August 11, 2026: Powerful 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

55°F

13°C

Humidity	100%
Wind Speed	Calm
Barometer	30.02 in
Dewpoint	55°F (13°C)
Visibility	7.00 mi
Last update	20 Aug 4:35 am CDT

More Information:

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

Extended Forecast for

Alden IL

Today
High: 79 °F
Patchy Fog
then Sunny
Tonight
Low: 59 °F
Partly Cloudy
Friday
High: 79 °F
Chance
Showers then
Chance
T-storms
Friday Night
Low: 61 °F
Chance
T-storms
Saturday
High: 77 °F
Sunny
Saturday Night
Low: 57 °F
Mostly Clear
Sunday
High: 75 °F
Sunny
Sunday Night
Low: 56 °F
Partly Cloudy
Monday
High: 76 °F
Mostly Sunny

Detailed Forecast

Today

Patchy fog before 8am. Otherwise, sunny, with a high near 79. Calm wind becoming east northeast around 5 mph.

Tonight

Partly cloudy, with a low around 59. Calm wind becoming south southwest around 5 mph.

Friday

A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

Friday Night

A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 61. Southwest wind around 5 mph becoming west northwest after midnight. Winds could gust as high as 10 mph.

Saturday

Sunny, with a high near 77. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

Saturday Night

Mostly clear, with a low around 57.

Sunday

Sunny, with a high near 75.

Sunday Night

Partly cloudy, with a low around 56.

Monday

Mostly sunny, with a high near 76.

Monday Night

Partly cloudy, with a low around 58.