St. Marie, MT Weather & Growing Conditions
Tonight
31°F
Patchy Fog
Patchy fog. Mostly clear, with a low around 31. East southeast wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 31°F | Patchy Fog | 6 mph ESE | 0% |
| Wednesday | 48°F | Patchy Fog then Mostly Sunny | 5 mph NW | 0% |
| Wednesday Night | 30°F | Mostly Cloudy | 3 to 7 mph E | 0% |
| Thursday | 48°F | Mostly Sunny | 5 to 10 mph SSE | 0% |
| Thursday Night | 32°F | Partly Cloudy | 5 to 9 mph WSW | 0% |
| Friday | 50°F | Sunny | 7 to 12 mph WSW | 4% |
| Friday Night | 35°F | Partly Cloudy | 8 to 13 mph WSW | 5% |
| Saturday | 53°F | Sunny | 6 to 15 mph W | 2% |
| Saturday Night | 33°F | Mostly Clear | 8 mph S | 0% |
| Sunday | 58°F | Mostly Sunny | 9 mph SSW | 0% |
| Sunday Night | 37°F | Partly Cloudy | 9 to 18 mph W | 0% |
| Monday | 51°F | Mostly Sunny | 5 to 14 mph W | 1% |
| Monday Night | 34°F | Partly Cloudy | 5 to 8 mph S | 0% |
| Tuesday | 54°F | Mostly Sunny | 7 to 10 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Marie, MT
Last spring frost
May 13
First fall frost
Sep 27
Growing season
134 days
Hardiness zone
4a
Explore more for St. Marie, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, St Marie, Mt (1.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.