Summit, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Summit, IL in one place.
Sunny, with a high near 94. Heat index values as high as 105. West wind 6 to 9 mph.
Local Weather Overview
This forecast page for Summit, 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 17, 2026 7:59 PM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Summit, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 7:59 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Summit
Tuesday looks like the warmest upcoming period in Summit at 97 degrees F.
Wednesday Night is the coolest period ahead with temperatures near 64 degrees F.
The strongest winds are forecast for Tuesday at about 7 to 12 mph W.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 7:59 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LSX
- Radar station
- KLSX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms between 11pm and 2am. Partly cloudy, with a low around 75. Heat index values as high as 103. West wind 2 to 9 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92. North wind around 5 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 72. Chance of precipitation is 40%.
Mostly sunny, with a high near 95.
Mostly clear, with a low around 77.
Sunny, with a high near 97.
Mostly clear, with a low around 71.
Sunny, with a high near 86.
Partly cloudy, with a low around 64.
Mostly sunny, with a high near 85.
Partly cloudy, with a low around 67.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Sunny
|
94°F |
6 to 9 mph
W
|
|
Saturday Night
Jul 18
|
Slight Chance Showers And Thunderstorms
|
75°F |
2 to 9 mph
W
|
|
Sunday
Jul 19
|
Mostly Sunny then Chance Showers And Thunderstorms
|
92°F |
5 mph
N
|
|
Sunday Night
Jul 19
|
Chance Showers And Thunderstorms then Mostly Clear
|
72°F |
1 to 5 mph
E
|
|
Monday
Jul 20
|
Mostly Sunny
|
95°F |
1 to 5 mph
S
|
|
Monday Night
Jul 20
|
Mostly Clear
|
77°F |
7 mph
SW
|
|
Tuesday
Jul 21
|
Sunny
|
97°F |
7 to 12 mph
W
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
71°F |
7 to 10 mph
N
|
|
Wednesday
Jul 22
|
Sunny
|
86°F |
7 to 10 mph
N
|
|
Wednesday Night
Jul 22
|
Partly Cloudy
|
64°F |
3 to 10 mph
NE
|
|
Thursday
Jul 23
|
Mostly Sunny
|
85°F |
6 mph
E
|
|
Thursday Night
Jul 23
|
Partly Cloudy
|
67°F |
2 to 6 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Summit.
