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August 11, 2026: Derecho produces widespread wind damage and tornadoes across northern Illinois and northwest Indiana

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Albertus Airport (KFEP)

Lat: 42.25°NLon: 89.58°WElev: 837ft.

Thunderstorm in Vicinity

75°F

24°C

Humidity	95%
Wind Speed	Calm
Barometer	30.01 in
Dewpoint	73°F (23°C)
Visibility	7.00 mi
Last update	15 Aug 11:15 pm CDT

More Information:

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

Extended Forecast for

Pecatonica IL

Tonight
Low: 72 °F
Showers
Likely
Sunday
High: 82 °F
Slight Chance
Showers then
Partly Sunny
Sunday Night
Low: 61 °F
Partly Cloudy
Monday
High: 80 °F
Sunny
Monday Night
Low: 60 °F
Mostly Clear
Tuesday
High: 81 °F
Partly Sunny
then Chance
T-storms
Tuesday Night
Low: 62 °F
Showers
Wednesday
High: 77 °F
Chance
Showers
Wednesday Night
Low: 54 °F
Partly Cloudy

Detailed Forecast

Tonight

A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 72. South wind around 5 mph becoming west after midnight. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday

A 20 percent chance of showers before 8am. Mostly cloudy, with a high near 82. West northwest wind 5 to 15 mph.

Sunday Night

Partly cloudy, with a low around 61. North northwest wind 5 to 10 mph.

Monday

Sunny, with a high near 80. Calm wind becoming northwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.

Monday Night

Mostly clear, with a low around 60. Calm wind becoming southwest around 5 mph after midnight.

Tuesday

A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81.

Tuesday Night

Showers and possibly a thunderstorm. Low around 62. Chance of precipitation is 80%.