St. Charles, ID Weather & Growing Conditions
Today
75°F
Patchy Smoke
Patchy smoke before 3pm. Sunny, with a high near 75. South southwest wind 5 to 12 mph, with gusts as high as 22 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Patchy Smoke | 5 to 12 mph SSW | 0% |
| Tonight | 47°F | Patchy Smoke | 3 to 12 mph NNW | 0% |
| Wednesday | 77°F | Areas Of Smoke | 3 to 10 mph SW | 0% |
| Wednesday Night | 50°F | Mostly Clear | 5 to 9 mph SW | 0% |
| Thursday | 82°F | Sunny | 5 to 12 mph SW | 0% |
| Thursday Night | 55°F | Mostly Clear | 3 to 9 mph NNW | 0% |
| Friday | 85°F | Sunny | 3 to 9 mph SSW | 0% |
| Friday Night | 57°F | Mostly Clear | 3 to 9 mph N | 0% |
| Saturday | 85°F | Sunny | 3 to 9 mph SSW | 0% |
| Saturday Night | 59°F | Mostly Clear | 3 to 9 mph NW | 0% |
| Sunday | 83°F | Mostly Sunny | 5 to 9 mph SSW | 3% |
| Sunday Night | 59°F | Partly Cloudy | 5 to 10 mph N | 3% |
| Monday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 9 mph S | 15% |
| Monday Night | 57°F | Partly Cloudy | 5 to 9 mph SSW | 7% |
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 Aug 4, 2026.