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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 42.09°N 87.98°W (Text-Only)
NWS Forecast for: Arlington Heights IL
Issued by: National Weather Service Chicago, IL
Last Update: 2:41 am CDT Jun 30, 2026		Print

  • Overnight

    Overnight: Mostly clear, with a low around 78. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 78 °F

    Mostly Clear



  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 95. Heat index values as high as 106. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 95 °F

    Hot



  • Tuesday
    Night

    Tuesday Night: Mostly clear, with a low around 78. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 78 °F

    Mostly Clear



  • Wednesday

    Wednesday: Sunny and hot, with a high near 96. Heat index values as high as 104. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 96 °F

    Hot



  • Wednesday
    Night

    Wednesday Night: Mostly clear, with a low around 78. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 78 °F

    Mostly Clear



  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 95.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday
    Night

    Thursday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 75. Chance of precipitation is 60%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92.

    High: 92 °F

    Showers
    Likely


  • Friday
    Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms




    • Overnight: Mostly clear, with a low around 78. South southwest wind around 10 mph, with gusts as high as 20 mph.

    Tuesday: Mostly sunny and hot, with a high near 95. Heat index values as high as 106. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    Tuesday Night: Mostly clear, with a low around 78. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    Wednesday: Sunny and hot, with a high near 96. Heat index values as high as 104. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Wednesday Night: Mostly clear, with a low around 78. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 95.

    Thursday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 75. Chance of precipitation is 60%.

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92.

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 72.

    Independence Day: A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88.

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 69.

    Sunday: A chance of showers and thunderstorms. Partly sunny, with a high near 87.

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 67.

    Monday: Mostly sunny, with a high near 85.


    Arlington Heights IL
     42.09°N 87.98°W

    Visit your local NWS office at: https://www.weather.gov/lot