St. Charles, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a city in Kane County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind around 10 mph.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 10 mph SSW | 0% |
| Tonight | 67°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 40% |
| Wednesday | 79°F | Showers And Thunderstorms Likely | 5 mph SW | 74% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 0 to 5 mph NW | 86% |
| Thursday | 80°F | Rain Showers Likely | 0 to 5 mph E | 61% |
| Thursday Night | 62°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 25% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph S | 6% |
| Friday Night | 64°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph SSW | 15% |
| Saturday | 84°F | Mostly Sunny | 5 to 10 mph SW | 10% |
| Saturday Night | 68°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSW | 19% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 19% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 40% |
| Monday | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 40% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 5 to 10 mph WSW | 45% |
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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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 Aug 4, 2026.