Summit, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a village in Cook County, Illinois.
Overnight
65°F
Mostly Clear
Mostly clear, with a low around 65. South wind around 5 mph.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 65°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 86°F | Mostly Sunny | 5 to 10 mph SSW | 2% |
| Tuesday Night | 69°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 19% |
| Wednesday | 81°F | Slight Chance Showers And Thunderstorms | 5 mph WSW | 65% |
| Wednesday Night | 66°F | Showers And Thunderstorms | 5 mph W | 90% |
| Thursday | 78°F | Rain Showers | 0 to 5 mph ESE | 76% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SE | 31% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph S | 5% |
| Friday Night | 66°F | Mostly Clear | 0 to 5 mph S | 8% |
| Saturday | 85°F | Mostly Sunny | 5 to 10 mph SSW | 9% |
| Saturday Night | 70°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 18% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 10 to 15 mph SW | 18% |
| Sunday Night | 72°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 42% |
| Monday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 42% |
Forecast source: National Weather Service (api.weather.gov) for Summit (41.788, -87.814). Updated through the day.
Growing snapshot for Summit
Last spring frost
Apr 11
First fall frost
Oct 31
Growing season
201 days
Hardiness zone
6a
More local growing data for Summit: nearby ZIP 60501 weather · frost dates · planting calendar · Illinois frost dates
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Chicago
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Climate data from the nearest NOAA station, Chicago Midway Ap, Il (3.7 mi from Summit). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.