St. Marie, MT Weather & Growing Conditions
Today
51°F
Sunny
Sunny. High near 51, with temperatures falling to around 43 in the afternoon. North wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 51°F | Sunny | 3 mph N | 0% |
| Tonight | 28°F | Partly Cloudy | 6 mph E | 0% |
| Thursday | 47°F | Mostly Sunny | 5 to 10 mph S | 0% |
| Thursday Night | 32°F | Partly Cloudy | 6 to 9 mph WSW | 0% |
| Friday | 48°F | Sunny | 7 to 12 mph WSW | 0% |
| Friday Night | 34°F | Partly Cloudy | 7 to 13 mph SW | 0% |
| Saturday | 52°F | Sunny | 6 to 14 mph W | 0% |
| Saturday Night | 32°F | Partly Cloudy | 7 mph SSW | 0% |
| Sunday | 58°F | Mostly Sunny | 7 to 10 mph SW | 0% |
| Sunday Night | 37°F | Partly Cloudy | 10 to 16 mph W | 0% |
| Monday | 51°F | Mostly Sunny | 5 to 13 mph W | 0% |
| Monday Night | 33°F | Partly Cloudy | 6 mph SW | 2% |
| Tuesday | 53°F | Mostly Sunny | 6 to 10 mph SSW | 2% |
| Tuesday Night | 35°F | Partly Cloudy | 7 mph WSW | 2% |
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 Nov 4, 2026.