National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago / Wheeling, Pal-Waukee Airport (KPWK)

Lat: 42.12°NLon: 87.9°WElev: 646ft.

Overcast

68°F

20°C

Humidity 73%
Wind Speed SE 12 G 21 mph
Barometer 30.01 in (1015.9 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 19 Sep 2:52 am CDT
Extended Forecast for

Arlington Heights IL

Flood Watch September 19, 04:00am until September 19, 01:00pm
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Steady temperature around 66. East southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    T-storms

  • Saturday

    Saturday: Showers and thunderstorms, mainly before 1pm, then showers likely and possibly a thunderstorm after 5pm. High near 76. East southeast wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    High: 76 °F

    T-storms then
    T-storms
    Likely

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 8pm. Low around 63. Southeast wind 5 to 10 mph becoming north northwest after midnight. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Low: 63 °F

    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 8am, then a chance of showers. Cloudy, with a high near 69. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 56. East northeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 56 °F

    Slight Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers. Cloudy, with a high near 64.

    High: 64 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62.

    High: 62 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 4am. Steady temperature around 66. East southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
Showers and thunderstorms, mainly before 1pm, then showers likely and possibly a thunderstorm after 5pm. High near 76. East southeast wind 5 to 10 mph becoming south in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Saturday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 8pm. Low around 63. Southeast wind 5 to 10 mph becoming north northwest after midnight. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers likely and possibly a thunderstorm before 8am, then a chance of showers. Cloudy, with a high near 69. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 56. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday
A 20 percent chance of showers. Cloudy, with a high near 64.
Monday Night
Mostly cloudy, with a low around 53.
Tuesday
Mostly cloudy, with a high near 62.
Tuesday Night
Mostly cloudy, with a low around 53.
Wednesday
Partly sunny, with a high near 64.
Wednesday Night
Mostly cloudy, with a low around 54.
Thursday
Partly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Arlington Heights IL
 42.09°N 87.98°W
Last Update:
2:31 am CDT Sep 19, 2026
Forecast Valid:
3am CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation