St. Charles, ID Weather & Growing Conditions
Overnight
44°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Mostly cloudy. Low around 44, with temperatures rising to around 46 overnight. East wind around 6 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Slight Chance Showers And Thunderstorms | 6 mph E | 19% |
| Saturday | 54°F | Slight Chance Light Rain then Slight Chance Showers And Thunderstorms | 3 to 8 mph NW | 35% |
| Saturday Night | 36°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 to 7 mph N | 27% |
| Sunday | 57°F | Mostly Sunny | 5 mph NNW | 0% |
| Sunday Night | 38°F | Mostly Clear | 6 mph N | 0% |
| Monday | 62°F | Sunny | 5 mph SE | 0% |
| Monday Night | 42°F | Partly Cloudy | 1 to 5 mph NNE | 1% |
| Tuesday | 63°F | Mostly Sunny | 5 mph SE | 14% |
| Tuesday Night | 43°F | Chance Showers And Thunderstorms then Chance Light Rain | 5 mph S | 37% |
| Wednesday | 64°F | Mostly Sunny | 6 mph SSW | 14% |
| Wednesday Night | 42°F | Mostly Clear | 5 mph W | 1% |
| Thursday | 66°F | Sunny | 5 mph SSE | 2% |
| Thursday Night | 43°F | Partly Cloudy | 2 to 6 mph SSW | 0% |
| Friday | 66°F | Mostly Sunny | 6 mph SSE | 3% |
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 Sep 19, 2026.