St. Ignatius, MT Weather & Growing Conditions
Today
44°F
Sunny
Sunny, with a high near 44. Northwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 44°F | Sunny | 2 mph NW | 0% |
| Tonight | 34°F | Mostly Clear | 3 mph SE | 0% |
| Thursday | 42°F | Mostly Cloudy then Slight Chance Light Rain | 3 mph SSW | 22% |
| Thursday Night | 34°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph S | 16% |
| Friday | 46°F | Mostly Sunny | 5 mph S | 2% |
| Friday Night | 41°F | Mostly Cloudy | 3 to 7 mph SSE | 2% |
| Saturday | 54°F | Mostly Sunny | 1 to 5 mph SSE | 2% |
| Saturday Night | 45°F | Partly Cloudy | 2 to 12 mph SE | 7% |
| Sunday | 57°F | Slight Chance Light Rain | 3 to 12 mph SSW | 16% |
| Sunday Night | 41°F | Slight Chance Light Rain then Mostly Cloudy | 5 mph SSW | 18% |
| Monday | 52°F | Mostly Cloudy then Slight Chance Light Rain | 3 mph SW | 10% |
| Monday Night | 43°F | Slight Chance Light Rain | 1 to 5 mph ESE | 10% |
| Tuesday | 55°F | Mostly Sunny then Slight Chance Light Rain | 5 mph S | 20% |
| Tuesday Night | 45°F | Slight Chance Light Rain | 2 to 8 mph SSE | 20% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Ignatius, MT
Last spring frost
May 12
First fall frost
Oct 2
Growing season
142 days
Hardiness zone
6a
Explore more for St. Ignatius, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Saint Ignatius, Mt (4.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.