St. Charles, ID Weather & Growing Conditions
Overnight
29°F
Cloudy
Cloudy. Low around 29, with temperatures rising to around 31 overnight. Southeast wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 29°F | Cloudy | 7 mph SE | 4% |
| Wednesday | 42°F | Mostly Cloudy | 5 mph NW | 5% |
| Wednesday Night | 27°F | Partly Cloudy | 5 mph NNE | 2% |
| Thursday | 40°F | Mostly Cloudy | 5 mph WSW | 8% |
| Thursday Night | 29°F | Partly Cloudy | 6 mph NW | 8% |
| Friday | 41°F | Sunny | 5 mph NW | 1% |
| Friday Night | 26°F | Partly Cloudy | 5 mph NNW | 0% |
| Saturday | 45°F | Sunny | 0 to 3 mph N | 0% |
| Saturday Night | 29°F | Mostly Clear | 0 to 6 mph NNE | 0% |
| Sunday | 49°F | Sunny | 0 to 6 mph SE | 0% |
| Sunday Night | 32°F | Partly Cloudy | 0 to 5 mph ENE | 0% |
| Monday | 49°F | Mostly Sunny | 0 to 5 mph ESE | 0% |
| Monday Night | 33°F | Mostly Cloudy | 0 to 5 mph E | 0% |
| Tuesday | 49°F | Mostly Sunny | 1 to 5 mph SSE | 1% |
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 (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.