Arlington Heights, IL Weather Tomorrow

See what tomorrow's weather has in store for Arlington Heights with a reliable 5 day forecast featuring precipitation potential, daytime and nighttime forecasts, temperature highs and lows in Fahrenheit and Celsius, sunrise and sunset times, cloud cover, wind chill, wind speed, and wind direction for the Arlington Heights area and around Cook county, Illinois.
Updated: Thu Aug 27th 2026 7:15 PM CDT
Arlington Heights, IL Weather – 8-27 – Sunny
83° / 63°
Sunny
It will be sunny in Arlington Heights, with a high of 83°F and a low of 63°F. There's a very small chance of rainfall, only about 7%. Winds will be light at 7mph and gusts of 5.6mph at 10 PM. The humidity will be on the higher side, averaging about 74%, the maximum being 74% at 11 PM and 72% being its lowest at 8 PM. Barometric pressure is its highest of 30.01inHg at 9 PM, a lowest point of 29.99inHg at 8 PM with an avg 30.01inHg.
Arlington Heights, IL Weather – 8-28 – Sunny
84° / 66°

Weather Tomorrow

Sunny
Arlington Heights may see a sunny day, with daytime highs of 84°F and overnight lows near 66°F. There's a very small chance of rainfall, only about 4%. Winds will be light at 10mph and gusts of 19.7mph at 5 PM. Humidity levels should be comfortable, sitting around 56% on average, the maximum being 75% at 6 AM and 36% being its lowest at 3 PM. Barometric pressure is its highest of 30.12inHg at 7 AM, a lowest point of 30.01inHg at 12 AM with an avg 30.08inHg.
Arlington Heights, IL Weather – 8-29 – Overcast
83° / 66°
Overcast
In Arlington Heights, it will be overcast with highs near 83°F and lows around 66°F. There might be light rainfall having a 13% chance. Winds will be light at 10mph and gusts of 18.6mph at 4 PM. The humidity will be on the higher side, averaging about 61%, the maximum being 73% at 6 AM and 38% being its lowest at 2 PM. Barometric pressure is its highest of 30.14inHg at 10 AM, a lowest point of 30.01inHg at 8 PM with an avg 30.08inHg.
Arlington Heights, IL Weather – 8-30 – Overcast
87° / 70°
Overcast
In Arlington Heights, cloud-filled skies are likely with a high near 87°F and a low around 70°F. There's a moderate 49% chance of rainfall with an estimated 0.03in. Wind will be moderate, blowing around 15mph on average and gusts of 30.9mph at 9 PM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 84% at 5 AM and 40% being its lowest at 1 PM. Barometric pressure is its highest of 30.02inHg at 12 AM, a lowest point of 29.87inHg at 8 PM with an avg 29.95inHg.
Arlington Heights, IL Weather – 8-31 – Overcast
93° / 77°
Overcast
Daytime highs will reach 93°F with lows dropping to 77°F in Arlington Heights, where skies will be overcast. There's a moderate 36% chance of rainfall with an estimated 0.02in. Wind will be moderate, blowing around 14mph on average and gusts of 36.7mph at 9 PM. Humidity levels should be comfortable, sitting around 50% on average, the maximum being 63% at 4 AM and 42% being its lowest at 11 PM. Barometric pressure is its highest of 29.89inHg at 2 AM, a lowest point of 29.76inHg at 8 PM with an avg 29.82inHg.
Arlington Heights, IL Weather – 9-1 – Sunny
96° / 80°
Sunny
A sunny day is in the forecast for Arlington Heights, with a high of 96°F and a low of 80°F. There's a very small chance of rainfall, only about 2%. Wind will be moderate, blowing around 13mph on average and gusts of 37.4mph at 3 AM. Humidity levels should be comfortable, sitting around 44% on average, the maximum being 61% at 11 PM and 33% being its lowest at 1 PM. Barometric pressure is its highest of 29.86inHg at 8 PM, a lowest point of 29.79inHg at 3 AM with an avg 29.84inHg.

Currently

Sunny 77°F
29.99 inHg.
Barometer
67%
Humidity
ENE 5.8 mph
Wind
Sunny

5 Day Forecast Nearby

More Local Information

Bookmark and Share

Get the LocalConditions.com App on Google Play
Sign up for a membership to go Ad free

Arlington Heights Community Weather Reports

Write your own Arlington Heights, IL report, forecast, or traffic update:


Will not be posted, shared or used for marketing!

Please note by clicking on "Post" you acknowledge that you have read our Privacy Policy and Terms of Service and the Arlington Heights, IL report and/or forecast you are posting is in compliance with such terms. If you are under 18, do not submit this form. Be respectful! Inappropriate content will be removed by a moderator.