St. Charles, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a city in Kane County, Illinois.
This Afternoon
72°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a high near 72. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Chance Rain Showers | 10 mph E | 29% |
| Tonight | 62°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 10 mph E | 50% |
| Saturday | 77°F | Showers And Thunderstorms Likely | 5 to 10 mph SE | 87% |
| Saturday Night | 64°F | Showers And Thunderstorms Likely then Showers And Thunderstorms | 5 to 10 mph NE | 80% |
| Sunday | 68°F | Showers And Thunderstorms | 10 to 15 mph NNE | 80% |
| Sunday Night | 55°F | Rain Showers Likely | 15 mph ENE | 59% |
| Monday | 65°F | Chance Rain Showers | 15 mph ENE | 48% |
| Monday Night | 51°F | Chance Rain Showers | 10 to 15 mph ENE | 32% |
| Tuesday | 63°F | Slight Chance Rain Showers | 10 to 15 mph NE | 22% |
| Tuesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NE | 14% |
| Wednesday | 66°F | Partly Sunny | 5 to 10 mph NNE | 8% |
| Wednesday Night | 51°F | Mostly Cloudy | 5 to 10 mph NNE | 4% |
| Thursday | 69°F | Partly Sunny | 5 to 10 mph NNE | 4% |
| Thursday Night | 52°F | Partly Cloudy | 5 mph NNE | 3% |
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
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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 Sep 19, 2026.