St. Marie, MT Weather & Growing Conditions
Overnight
41°F
Partly Cloudy
Partly cloudy, with a low around 41. West wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 41°F | Partly Cloudy | 7 mph W | 0% |
| Tuesday | 72°F | Sunny | 8 to 14 mph WNW | 0% |
| Tuesday Night | 50°F | Mostly Clear | 3 to 12 mph WSW | 1% |
| Wednesday | 82°F | Partly Sunny | 6 to 16 mph WSW | 0% |
| Wednesday Night | 54°F | Partly Cloudy | 5 to 15 mph N | 0% |
| Thursday | 88°F | Sunny | 3 to 13 mph WNW | 0% |
| Thursday Night | 56°F | Mostly Clear | 13 mph N | 0% |
| Friday | 87°F | Sunny | 7 to 10 mph ESE | 0% |
| Friday Night | 57°F | Mostly Clear | 7 to 14 mph NE | 1% |
| Saturday | 86°F | Sunny | 13 mph E | 0% |
| Saturday Night | 59°F | Partly Cloudy | 9 to 16 mph NE | 2% |
| Sunday | 85°F | Partly Sunny | 13 to 16 mph ENE | 3% |
| Sunday Night | 57°F | Partly Cloudy | 13 to 17 mph NE | 14% |
| Monday | 82°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 13 to 16 mph ENE | 23% |
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 Aug 4, 2026.