St. Charles, ID Weather & Growing Conditions
Today
81°F
Patchy Smoke
Patchy smoke before 3pm. Sunny, with a high near 81. South southwest wind 3 to 9 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Patchy Smoke | 3 to 9 mph SSW | 0% |
| Tonight | 46°F | Patchy Smoke | 2 to 8 mph WNW | 0% |
| Wednesday | 83°F | Areas Of Smoke | 2 to 7 mph WSW | 0% |
| Wednesday Night | 50°F | Mostly Clear | 2 to 7 mph SW | 0% |
| Thursday | 87°F | Sunny | 2 to 8 mph SW | 0% |
| Thursday Night | 55°F | Clear | 2 to 6 mph SW | 0% |
| Friday | 90°F | Sunny | 2 to 8 mph SSW | 0% |
| Friday Night | 57°F | Mostly Clear | 2 to 7 mph WNW | 0% |
| Saturday | 90°F | Sunny | 2 to 7 mph SE | 0% |
| Saturday Night | 59°F | Mostly Clear | 3 to 7 mph W | 0% |
| Sunday | 89°F | Mostly Sunny | 2 to 8 mph S | 4% |
| Sunday Night | 58°F | Partly Cloudy | 3 to 7 mph WSW | 5% |
| Monday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 8 mph SSW | 15% |
| Monday Night | 57°F | Partly Cloudy | 3 to 7 mph SW | 8% |
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 Aug 4, 2026.