Summit, IL Weather Forecast
Local 7-day forecast
Mostly Clear
Track current conditions, temperature changes, wind, and the full daily outlook for Summit, IL in one place.
Mostly clear, with a low around 43. Northwest wind 6 to 15 mph, with gusts as high as 24 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: Nov 11, 2026 9:29 PM CST.
The active forecast window currently covers Nov 11 to Nov 18, 2026 for Summit, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Nov 11 to Nov 18, 2026
- Latest sync
- Nov 11, 2026 9:29 PM CST
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Summit
Wednesday looks like the warmest upcoming period in Summit at 59 degrees F.
Saturday Night is the coolest period ahead with temperatures near 26 degrees F.
The strongest winds are forecast for Thursday at about 8 to 16 mph NW.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Nov 11, 2026 9:29 PM CST
- Coverage
- 7 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 rain showers between noon and 2pm. Partly sunny. High near 52, with temperatures falling to around 48 in the afternoon. Northwest wind 8 to 16 mph. Chance of precipitation is 20%.
Mostly clear, with a low around 31. Northwest wind 7 to 13 mph, with gusts as high as 21 mph.
Sunny. High near 46, with temperatures falling to around 42 in the afternoon. Northwest wind 7 to 12 mph.
Clear, with a low around 27. North wind 1 to 6 mph.
Sunny. High near 48, with temperatures falling to around 42 in the afternoon.
Mostly clear, with a low around 26.
Mostly sunny, with a high near 51.
Partly cloudy, with a low around 30.
Sunny, with a high near 52.
Mostly clear, with a low around 30.
Sunny, with a high near 55.
Mostly clear, with a low around 32.
Sunny, with a high near 59.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tonight
Nov 11
|
Mostly Clear
|
43°F |
6 to 15 mph
NW
|
|
Thursday
Nov 12
|
Partly Sunny then Slight Chance Rain Showers
|
52°F |
8 to 16 mph
NW
|
|
Thursday Night
Nov 12
|
Mostly Clear
|
31°F |
7 to 13 mph
NW
|
|
Friday
Nov 13
|
Sunny
|
46°F |
7 to 12 mph
NW
|
|
Friday Night
Nov 13
|
Clear
|
27°F |
1 to 6 mph
N
|
|
Saturday
Nov 14
|
Sunny
|
48°F |
3 mph
N
|
|
Saturday Night
Nov 14
|
Mostly Clear
|
26°F |
0 mph
|
|
Sunday
Nov 15
|
Mostly Sunny
|
51°F |
0 to 3 mph
E
|
|
Sunday Night
Nov 15
|
Partly Cloudy
|
30°F |
2 mph
E
|
|
Monday
Nov 16
|
Sunny
|
52°F |
1 to 5 mph
E
|
|
Monday Night
Nov 16
|
Mostly Clear
|
30°F |
2 mph
E
|
|
Tuesday
Nov 17
|
Sunny
|
55°F |
1 to 5 mph
E
|
|
Tuesday Night
Nov 17
|
Mostly Clear
|
32°F |
2 mph
E
|
|
Wednesday
Nov 18
|
Sunny
|
59°F |
2 to 7 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Summit.
