Plains, MT Weather & Growing Conditions
This Afternoon
42°F
Partly Sunny
Partly sunny, with a high near 42. East wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 42°F | Partly Sunny | 3 mph E | 0% |
| Tonight | 31°F | Mostly Cloudy | 2 mph ENE | 1% |
| Wednesday | 46°F | Mostly Sunny | 3 mph ENE | 1% |
| Wednesday Night | 31°F | Partly Cloudy | 5 mph SW | 2% |
| Thursday | 44°F | Partly Sunny | 5 to 8 mph SW | 9% |
| Thursday Night | 34°F | Mostly Cloudy | 8 mph SW | 3% |
| Friday | 46°F | Partly Sunny | 6 to 9 mph SW | 13% |
| Friday Night | 37°F | Mostly Cloudy | 7 to 12 mph SW | 13% |
| Saturday | 50°F | Partly Sunny | 1 to 7 mph SSW | 3% |
| Saturday Night | 38°F | Mostly Cloudy | 1 to 5 mph S | 12% |
| Sunday | 54°F | Slight Chance Light Rain | 5 to 8 mph SW | 19% |
| Sunday Night | 38°F | Slight Chance Light Rain then Mostly Cloudy | 3 to 7 mph SW | 17% |
| Monday | 49°F | Mostly Cloudy | 3 mph SSW | 12% |
| Monday Night | 38°F | Slight Chance Light Rain | 1 to 5 mph SSW | 17% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Plains, MT
Growing season
101 days
Hardiness zone
6a
Explore more for Plains, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Saint Regis 1 Ne, Mt (20.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.