Summit, IL Weather Forecast
Local 7-day forecast
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Summit, IL in one place.
A slight chance of rain showers before 7am, then a chance of showers and thunderstorms between 7am and noon, then a slight chance of showers and thunderstorms between noon and 1pm, then a chance of showers and thunderstorms between 1pm and 2pm, then a slight chance of showers and thunderstorms between 2pm and 5pm. Partly sunny. High near 71, with temperatures falling to around 67 in the afternoon. West wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
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 15, 2026 8:19 PM CDT.
The active forecast window currently covers Apr 16 to Apr 22, 2026 for Summit, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 16 to Apr 22, 2026
- Latest sync
- Apr 15, 2026 8:19 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Summit
Friday looks like the warmest upcoming period in Summit at 79 degrees F.
Sunday Night is the coolest period ahead with temperatures near 36 degrees F.
The strongest winds are forecast for Saturday at about 15 to 20 mph W.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 15, 2026 8:19 PM CDT
- Coverage
- 7 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
Partly cloudy, with a low around 51. East wind around 5 mph, with gusts as high as 15 mph. New rainfall amounts less than a tenth of an inch possible.
Partly sunny, with a high near 79. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Showers and thunderstorms after 7pm. Mostly cloudy, with a low around 48. South southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Showers and thunderstorms. Partly sunny, with a high near 58. Chance of precipitation is 90%.
A slight chance of rain showers before 7pm. Partly cloudy, with a low around 37.
Mostly sunny, with a high near 52.
Partly cloudy, with a low around 36.
Sunny, with a high near 60.
Partly cloudy, with a low around 49.
Mostly sunny, with a high near 72.
Partly cloudy, with a low around 50.
Mostly sunny, with a high near 67.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Apr 16
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
71°F |
10 mph
W
|
|
Thursday Night
Apr 16
|
Partly Cloudy
|
51°F |
5 mph
E
|
|
Friday
Apr 17
|
Partly Sunny
|
79°F |
5 to 15 mph
SSE
|
|
Friday Night
Apr 17
|
Showers And Thunderstorms
|
48°F |
15 mph
SSW
|
|
Saturday
Apr 18
|
Showers And Thunderstorms
|
58°F |
15 to 20 mph
W
|
|
Saturday Night
Apr 18
|
Slight Chance Rain Showers then Partly Cloudy
|
37°F |
10 to 15 mph
WNW
|
|
Sunday
Apr 19
|
Mostly Sunny
|
52°F |
10 to 15 mph
WNW
|
|
Sunday Night
Apr 19
|
Partly Cloudy
|
36°F |
5 to 10 mph
NNW
|
|
Monday
Apr 20
|
Sunny
|
60°F |
5 to 10 mph
ESE
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
49°F |
10 to 15 mph
SSW
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
72°F |
15 mph
SW
|
|
Tuesday Night
Apr 21
|
Partly Cloudy
|
50°F |
10 to 15 mph
WSW
|
|
Wednesday
Apr 22
|
Mostly Sunny
|
67°F |
10 mph
SSW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Summit.