St. Marie, MT Weather & Growing Conditions
Today
71°F
Sunny
Sunny, with a high near 71. West northwest wind 6 to 14 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Sunny | 6 to 14 mph WNW | 0% |
| Tonight | 49°F | Mostly Clear | 2 to 13 mph WSW | 1% |
| Wednesday | 81°F | Partly Sunny | 7 to 16 mph WSW | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 3 to 15 mph WNW | 0% |
| Thursday | 86°F | Sunny | 3 to 13 mph WNW | 0% |
| Thursday Night | 54°F | Mostly Clear | 8 to 12 mph N | 0% |
| Friday | 86°F | Sunny | 7 mph E | 0% |
| Friday Night | 55°F | Mostly Clear | 7 to 10 mph ENE | 1% |
| Saturday | 86°F | Sunny | 10 mph E | 0% |
| Saturday Night | 56°F | Partly Cloudy | 8 to 13 mph NE | 4% |
| Sunday | 84°F | Mostly Sunny | 14 mph ENE | 4% |
| Sunday Night | 55°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 14 mph NE | 17% |
| Monday | 81°F | Chance Showers And Thunderstorms | 14 mph ENE | 25% |
| Monday Night | 54°F | Chance Showers And Thunderstorms | 13 mph ENE | 31% |
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 Aug 4, 2026.