Arlington Heights, IL Weather Forecast
Local 7-day forecast
Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Arlington Heights, IL in one place.
A slight chance of rain showers between 7am and 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers and thunderstorms likely. Mostly sunny, with a high near 90. Chance of precipitation is 60%.
Local Weather Overview
This forecast page for Arlington Heights, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 14, 2026 8:27 PM CDT.
The active forecast window currently covers Jul 17 to Jul 21, 2026 for Arlington Heights, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 21, 2026
- Latest sync
- Jul 14, 2026 8:27 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Arlington Heights
Saturday looks like the warmest upcoming period in Arlington Heights at 91 degrees F.
Monday Night is the coolest period ahead with temperatures near 68 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 15 mph NW.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 14, 2026 8:27 PM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KLOT
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely before 7pm, then a slight chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 72.
A chance of showers and thunderstorms after 1pm. Sunny, with a high near 91.
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 69.
Mostly sunny, with a high near 86.
Partly cloudy, with a low around 69.
A slight chance of rain showers between 7am and 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 88.
A chance of showers and thunderstorms. Partly cloudy, with a low around 68.
A chance of rain showers before 7am, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 17
|
Slight Chance Showers And Thunderstorms
|
90°F |
0 to 5 mph
SSE
|
|
Friday Night
Jul 17
|
Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms
|
72°F |
5 mph
SW
|
|
Saturday
Jul 18
|
Sunny then Chance Showers And Thunderstorms
|
91°F |
5 to 10 mph
W
|
|
Saturday Night
Jul 18
|
Chance Showers And Thunderstorms
|
69°F |
5 to 10 mph
NW
|
|
Sunday
Jul 19
|
Mostly Sunny
|
86°F |
5 to 10 mph
NE
|
|
Sunday Night
Jul 19
|
Partly Cloudy
|
69°F |
5 mph
SSW
|
|
Monday
Jul 20
|
Chance Showers And Thunderstorms
|
88°F |
5 to 10 mph
SW
|
|
Monday Night
Jul 20
|
Chance Showers And Thunderstorms
|
68°F |
5 to 10 mph
W
|
|
Tuesday
Jul 21
|
Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
83°F |
5 to 15 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Arlington Heights.
