Excessive Rainfall and Significant Flooding in the Upper Midwest This Weekend

Heavy to excessive rainfall is expected over the weekend across eastern Iowa, northern Missouri, northwest Illinois and southern Wisconsin. Numerous flash floods, some with significant impacts, are expected in these areas. Heaviest rainfall will occur overnight Saturday and Sunday, so be sure to have multiple ways to receive warnings. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

78°F

26°C

Humidity	69%
Wind Speed	S 7 mph
Barometer	30.02 in (1015.1 mb)
Dewpoint	67°F (19°C)
Visibility	10.00 mi
Heat Index	80°F (27°C)
Last update	9 Aug 5:51 am CDT

More Information:

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

Extended Forecast for

McHenry IL

Today
High: 93 °F
Mostly Sunny
then Chance
T-storms
Tonight
Low: 71 °F
Chance
T-storms then
Chance
Showers
Sunday
High: 86 °F
Chance
Showers then
Chance
T-storms
Sunday Night
Low: 71 °F
Chance
T-storms then
Showers
Likely
Monday
High: 84 °F
Showers
Likely
Monday Night
Low: 67 °F
Chance
T-storms
Tuesday
High: 84 °F
Chance
T-storms
Tuesday Night
Low: 66 °F
Partly Cloudy
Wednesday
High: 86 °F
Mostly Sunny

Detailed Forecast

Today

A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 93. Heat index values as high as 100. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

Tonight

A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 10 mph, with gusts as high as 20 mph.

Sunday

A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Heat index values as high as 95. South southwest wind around 10 mph, with gusts as high as 15 mph.

Sunday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. South wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 60%.

Monday

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 84. Southwest wind 5 to 10 mph. Chance of precipitation is 60%.

Monday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.

Tuesday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.

Tuesday Night

Partly cloudy, with a low around 66.

Wednesday

Mostly sunny, with a high near 86.

Wednesday Night

Partly cloudy, with a low around 66.

Thursday

A chance of showers. Mostly sunny, with a high near 86.