St. Charles, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a city in Kane County, Illinois.
Tonight
59°F
Rain Showers
Rain showers. Cloudy. Low around 59, with temperatures rising to around 61 overnight. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Rain Showers | 15 mph S | 89% |
| Wednesday | 62°F | Rain Showers Likely | 15 mph SSW | 56% |
| Wednesday Night | 47°F | Slight Chance Rain Showers | 15 mph SW | 18% |
| Thursday | 56°F | Chance Rain Showers | 10 to 15 mph WSW | 34% |
| Thursday Night | 42°F | Chance Rain Showers | 5 to 10 mph NW | 35% |
| Friday | 52°F | Slight Chance Rain Showers | 10 to 15 mph N | 23% |
| Friday Night | 35°F | Mostly Cloudy | 0 to 10 mph NNW | 4% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph WNW | 5% |
| Saturday Night | 34°F | Partly Cloudy | 0 to 5 mph WSW | 5% |
| Sunday | 57°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 15% |
| Sunday Night | 34°F | Mostly Clear | 5 mph WNW | 6% |
| Monday | 60°F | Sunny | 5 to 10 mph WSW | 3% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 2% |
| Tuesday | 61°F | Sunny | 5 to 10 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov) for St. Charles (41.919, -88.311). Updated through the day.
Growing snapshot for St. Charles
Last spring frost
Apr 25
First fall frost
Oct 19
Growing season
174 days
Hardiness zone
5b
More local growing data for St. Charles: nearby ZIP 60174 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Aurora
Batavia
Big Rock
Burlington
Campton Hills
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East Dundee
Elburn
Elgin
Geneva
Gilberts
Hampshire
Kaneville
Lily Lake
Maple Park
North Aurora
Pingree Grove
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Sleepy Hollow
South Elgin
Sugar Grove
Virgil
West Dundee
Climate data from the nearest NOAA station, West Chicago Dupage Ap, Il (2.9 mi from St. Charles). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.