St. Charles, ID Weather & Growing Conditions
Tonight
29°F
Cloudy
Cloudy. Low around 29, with temperatures rising to around 33 overnight. South southwest wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 29°F | Cloudy | 6 mph SSW | 2% |
| Wednesday | 50°F | Mostly Cloudy | 3 mph NNW | 7% |
| Wednesday Night | 26°F | Areas Of Fog | 3 mph WNW | 0% |
| Thursday | 49°F | Areas Of Fog then Slight Chance Light Rain | 2 mph SW | 15% |
| Thursday Night | 26°F | Slight Chance Rain And Snow then Areas Of Fog | 3 mph NW | 15% |
| Friday | 50°F | Mostly Sunny | 2 mph NW | 2% |
| Friday Night | 26°F | Partly Cloudy | 3 mph WNW | 2% |
| Saturday | 53°F | Sunny | 1 mph N | 0% |
| Saturday Night | 29°F | Mostly Clear | 0 to 3 mph SSE | 0% |
| Sunday | 57°F | Sunny | 0 to 3 mph SSE | 0% |
| Sunday Night | 31°F | Partly Cloudy | 2 mph SSW | 1% |
| Monday | 57°F | Mostly Sunny | 2 mph SE | 1% |
| Monday Night | 33°F | Partly Cloudy | 2 mph W | 3% |
| Tuesday | 56°F | Mostly Sunny | 2 mph WSW | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Charles, ID
Last spring frost
May 19
First fall frost
Sep 21
Growing season
123 days
Hardiness zone
5a
Explore more for St. Charles, ID: full frost dates · planting calendar · Idaho frost dates
Climate data from the nearest NOAA station, Lifton Pumping Stn, Id (4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.