St. Charles, ID Weather & Growing Conditions
Today
61°F
Slight Chance Light Rain then Slight Chance Showers And Thunderstorms
A slight chance of rain before noon, then a slight chance of showers and thunderstorms between noon and 3pm, then a chance of showers and thunderstorms. Mostly sunny. High near 61, with temperatures falling to around 58 in the afternoon. South southwest wind 1 to 6 mph. Chance of precipitation is 40%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Slight Chance Light Rain then Slight Chance Showers And Thunderstorms | 1 to 6 mph SSW | 39% |
| Tonight | 33°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph WNW | 27% |
| Sunday | 64°F | Mostly Sunny | 3 mph NNW | 0% |
| Sunday Night | 35°F | Mostly Clear | 5 mph N | 0% |
| Monday | 69°F | Sunny | 3 mph E | 0% |
| Monday Night | 41°F | Partly Cloudy | 3 mph NNE | 2% |
| Tuesday | 70°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 mph ESE | 18% |
| Tuesday Night | 40°F | Chance Showers And Thunderstorms then Chance Light Rain | 3 mph S | 39% |
| Wednesday | 71°F | Slight Chance Light Rain then Mostly Sunny | 2 mph S | 19% |
| Wednesday Night | 40°F | Mostly Clear | 2 mph SSW | 2% |
| Thursday | 73°F | Sunny | 2 mph SSE | 3% |
| Thursday Night | 43°F | Partly Cloudy | 3 mph SSW | 0% |
| Friday | 73°F | Mostly Sunny | 3 mph S | 4% |
| Friday Night | 43°F | Partly Cloudy | 1 to 5 mph SSW | 12% |
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 Sep 19, 2026.