National Weather Service Forecast for: Arlington Heights IL
Issued by: National Weather Service Chicago, IL
Updated: 8:41 pm CDT Aug 11, 2025
 
Tonight

Tonight: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 72. South southwest wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
T-storms
Likely
 Tuesday

Tuesday: Scattered showers and thunderstorms. Mostly cloudy, with a high near 82. South southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 50%.
Scattered
T-storms
 Tuesday
Night
Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 67. West southwest wind around 5 mph, with gusts as high as 10 mph.
Slight Chance
T-storms
 Wednesday

Wednesday: Sunny, with a high near 83. North northwest wind around 5 mph, with gusts as high as 10 mph.
Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.
Mostly Clear
 Thursday

Thursday: Sunny, with a high near 83.
Sunny
 Thursday
Night
Thursday Night: Mostly clear, with a low around 66.
Mostly Clear
 Friday

Friday: Sunny, with a high near 90.
Sunny
 Friday
Night
Friday Night: Partly cloudy, with a low around 73.
Partly Cloudy
Lo 72 °F Hi 82 °F Lo 67 °F Hi 83 °F Lo 64 °F Hi 83 °F Lo 66 °F Hi 90 °F Lo 73 °F

Hazardous Weather Outlook
 

Tonight
 
 Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 72. South southwest wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
 
 Scattered showers and thunderstorms. Mostly cloudy, with a high near 82. South southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 50%.
Tuesday Night
 
 A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 67. West southwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday
 
 Sunny, with a high near 83. North northwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday Night
 
 Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.
Thursday
 
 Sunny, with a high near 83.
Thursday Night
 
 Mostly clear, with a low around 66.
Friday
 
 Sunny, with a high near 90.
Friday Night
 
 Partly cloudy, with a low around 73.
Saturday
 
 Mostly sunny, with a high near 93.
Saturday Night
 
 Partly cloudy, with a low around 73.
Sunday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 87.
Sunday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Monday
 
 A chance of showers and thunderstorms. Partly sunny, with a high near 84.

 

Forecast from NOAA-NWS for Arlington Heights IL.