Severe Thunderstorms and Heavy Rainfall for the Southwest; Heat Spreads Across the Center of the Nation

Moisture will continue to move into areas of the West. This will increase showers and thunderstorms coverage and intensity, with the risk of flash flooding and damaging wind gusts. Meanwhile, heat across the Southwest will expand into the center of the nation this weekend into early next week. Trends favor this heat will spread across the Ohio Valley, mid-Atlantic next week. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

A Few Clouds

73°F

23°C

Humidity	71%
Wind Speed	S 10 mph
Barometer	30.00 in (1015.1 mb)
Dewpoint	63°F (17°C)
Visibility	10.00 mi
Last update	29 Aug 8:51 pm CDT

More Information:

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

Extended Forecast for

McHenry IL

Tonight
Low: 68 °F
Mostly Cloudy
then Slight
Chance
T-storms
Sunday
High: 85 °F
Scattered
Showers
Sunday Night
Low: 70 °F
Chance
Showers
Monday
High: 89 °F
Chance
Showers then
Partly Sunny
Monday Night
Low: 72 °F
Mostly Cloudy
then Slight
Chance
T-storms
Tuesday
High: 91 °F
Slight Chance
T-storms
Tuesday Night
Low: 74 °F
Partly Cloudy
Wednesday
High: 91 °F
Mostly Sunny
Wednesday Night
Low: 69 °F
Chance
Showers

Detailed Forecast

Tonight

A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 68. South wind around 10 mph.

Sunday

Scattered showers and thunderstorms, mainly after 3pm. Partly sunny, with a high near 85. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

Sunday Night

A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 70. South wind 5 to 10 mph.

Monday

A 30 percent chance of showers and thunderstorms before 7am. Partly sunny, with a high near 89. Heat index values as high as 96. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

Monday Night

A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72. Southwest wind around 5 mph, with gusts as high as 10 mph.

Tuesday

A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 91.

Tuesday Night

Partly cloudy, with a low around 74.

Wednesday

Mostly sunny, with a high near 91.

Wednesday Night

A chance of showers. Partly cloudy, with a low around 69.

Thursday

Mostly sunny, with a high near 85.

Thursday Night

Partly cloudy, with a low around 66.