St. Charles, ID Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Charles, a city in Bear Lake County, Idaho.
This Afternoon
67°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 67, with temperatures falling to around 63 in the afternoon. Northeast wind around 6 mph. Chance of precipitation is 80%.
7-day forecast for St. Charles
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Showers And Thunderstorms | 6 mph NE | 75% |
| Tonight | 38°F | Showers And Thunderstorms | 6 mph W | 78% |
| Saturday | 61°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 to 6 mph NNW | 40% |
| Saturday Night | 35°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph WNW | 17% |
| Sunday | 64°F | Mostly Sunny | 3 mph NNW | 1% |
| Sunday Night | 37°F | Mostly Clear | 5 mph N | 0% |
| Monday | 70°F | Sunny | 3 mph E | 0% |
| Monday Night | 42°F | Partly Cloudy | 3 mph N | 1% |
| Tuesday | 71°F | Mostly Sunny | 2 mph ESE | 9% |
| Tuesday Night | 42°F | Slight Chance Showers And Thunderstorms then Slight Chance Light Rain | 3 mph SSW | 23% |
| Wednesday | 71°F | Sunny | 3 mph SSE | 9% |
| Wednesday Night | 41°F | Mostly Clear | 2 mph NNE | 5% |
| Thursday | 73°F | Sunny | 3 mph SE | 5% |
| Thursday Night | 44°F | Partly Cloudy | 3 mph SSE | 5% |
Forecast source: National Weather Service (api.weather.gov) for St. Charles (42.112, -111.390). Updated through the day.
Growing snapshot for St. Charles
Last spring frost
May 19
First fall frost
Sep 21
Growing season
123 days
Hardiness zone
5a
More local growing data for St. Charles: nearby ZIP 83272 weather · frost dates · planting calendar · Idaho frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lifton Pumping Stn, Id (4 mi from St. Charles). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.