St. Marie, MT Weather & Growing Conditions
Today
66°F
Mostly Cloudy
Mostly cloudy, with a high near 66. East northeast wind 13 to 16 mph, with gusts as high as 23 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 66°F | Mostly Cloudy | 13 to 16 mph ENE | 0% |
| Tonight | 47°F | Mostly Cloudy | 12 mph E | 11% |
| Sunday | 61°F | Slight Chance Rain Showers then Mostly Cloudy | 13 mph ESE | 17% |
| Sunday Night | 45°F | Mostly Cloudy | 10 mph SE | 0% |
| Monday | 68°F | Mostly Sunny | 8 to 16 mph SSE | 2% |
| Monday Night | 48°F | Mostly Clear | 14 mph SSE | 0% |
| Tuesday | 74°F | Sunny | 13 mph SSE | 0% |
| Tuesday Night | 50°F | Mostly Clear | 7 mph SE | 1% |
| Wednesday | 77°F | Sunny | 5 to 9 mph SSE | 4% |
| Wednesday Night | 52°F | Mostly Clear | 7 mph SSE | 5% |
| Thursday | 78°F | Sunny | 6 to 12 mph SSE | 1% |
| Thursday Night | 52°F | Mostly Clear | 9 mph SE | 4% |
| Friday | 77°F | Mostly Sunny | 9 to 16 mph SE | 3% |
| Friday Night | 49°F | Partly Cloudy | 15 mph ESE | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Marie, MT
Last spring frost
Jun 5
First fall frost
Sep 2
Growing season
89 days
Hardiness zone
3b
Explore more for St. Marie, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Opheim 12 Sse, Mt (5.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.