Summit, IL Weather Forecast
Local 7-day forecast
Chance Rain Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Summit, IL in one place.
A chance of rain showers. Partly sunny. High near 61, with temperatures falling to around 56 in the afternoon. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
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: Apr 16, 2026 8:41 PM CDT.
The active forecast window currently covers Apr 18 to Apr 23, 2026 for Summit, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 18 to Apr 23, 2026
- Latest sync
- Apr 16, 2026 8:41 PM CDT
- Forecast office
- LSX
- Source
- NOAA / NWS
Daily Outlook
This Week in Summit
Wednesday looks like the warmest upcoming period in Summit at 79 degrees F.
Saturday Night is the coolest period ahead with temperatures near 40 degrees F.
The strongest winds are forecast for Saturday at about 15 mph NW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 16, 2026 8:41 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 chance of rain showers before 7pm. Mostly clear, with a low around 40. Northwest wind 6 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Sunny, with a high near 66.
Mostly clear, with a low around 42.
Sunny, with a high near 73.
Mostly clear, with a low around 52.
Sunny, with a high near 78.
Partly cloudy, with a low around 57.
Sunny, with a high near 79.
Mostly clear, with a low around 57.
A slight chance of rain showers between 7am and 1pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 79. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 18
|
Chance Rain Showers
|
61°F |
15 mph
NW
|
|
Saturday Night
Apr 18
|
Chance Rain Showers then Mostly Clear
|
40°F |
6 to 13 mph
NW
|
|
Sunday
Apr 19
|
Sunny
|
66°F |
6 to 13 mph
NW
|
|
Sunday Night
Apr 19
|
Mostly Clear
|
42°F |
3 to 8 mph
NE
|
|
Monday
Apr 20
|
Sunny
|
73°F |
3 to 9 mph
SE
|
|
Monday Night
Apr 20
|
Mostly Clear
|
52°F |
8 mph
S
|
|
Tuesday
Apr 21
|
Sunny
|
78°F |
8 to 13 mph
SW
|
|
Tuesday Night
Apr 21
|
Partly Cloudy
|
57°F |
6 to 10 mph
SW
|
|
Wednesday
Apr 22
|
Sunny
|
79°F |
6 to 9 mph
SW
|
|
Wednesday Night
Apr 22
|
Mostly Clear
|
57°F |
7 mph
S
|
|
Thursday
Apr 23
|
Chance Showers And Thunderstorms
|
79°F |
6 to 12 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Summit.
