Summit, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a village in Cook County, Illinois.
Tonight
61°F
Rain
Rain. Cloudy. Low around 61, with temperatures rising to around 63 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Rain | 15 mph S | 80% |
| Wednesday | 64°F | Chance Rain then Rain Showers Likely | 15 mph SSW | 57% |
| Wednesday Night | 50°F | Mostly Cloudy | 15 mph SW | 12% |
| Thursday | 58°F | Chance Rain Showers | 10 to 15 mph WSW | 27% |
| Thursday Night | 45°F | Chance Rain Showers | 5 to 10 mph WNW | 47% |
| Friday | 53°F | Chance Rain Showers | 10 mph N | 35% |
| Friday Night | 40°F | Mostly Cloudy | 5 to 10 mph NNW | 14% |
| Saturday | 52°F | Mostly Sunny | 5 mph WNW | 10% |
| Saturday Night | 38°F | Partly Cloudy | 5 mph WSW | 6% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 15% |
| Sunday Night | 39°F | Mostly Clear | 5 to 10 mph W | 10% |
| Monday | 60°F | Sunny | 5 to 10 mph WSW | 5% |
| Monday Night | 44°F | Mostly Clear | 5 to 10 mph W | 2% |
| Tuesday | 61°F | Mostly Sunny | 5 to 10 mph WNW | 1% |
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
Nearby towns & communities
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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 Nov 4, 2026.