St. Ignatius, MT Weather & Growing Conditions
Today
68°F
Mostly Sunny then Slight Chance Light Rain
A slight chance of rain between 1pm and 4pm. Mostly sunny, with a high near 68. West northwest wind around 2 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Mostly Sunny then Slight Chance Light Rain | 2 mph WNW | 18% |
| Tonight | 54°F | Partly Cloudy | 2 to 8 mph ESE | 4% |
| Sunday | 71°F | Sunny | 3 mph SW | 0% |
| Sunday Night | 55°F | Clear | 2 to 6 mph NE | 0% |
| Monday | 75°F | Sunny | 5 mph SSW | 0% |
| Monday Night | 57°F | Mostly Clear | 3 mph SSE | 0% |
| Tuesday | 74°F | Sunny | 3 mph SSW | 0% |
| Tuesday Night | 57°F | Mostly Clear | 1 to 5 mph ESE | 1% |
| Wednesday | 74°F | Sunny | 5 mph SW | 1% |
| Wednesday Night | 57°F | Partly Cloudy | 5 mph SE | 4% |
| Thursday | 73°F | Sunny | 3 mph SSW | 2% |
| Thursday Night | 56°F | Partly Cloudy | 1 to 5 mph ESE | 9% |
| Friday | 71°F | Mostly Sunny | 5 mph S | 9% |
| Friday Night | 52°F | Chance Light Rain | 5 mph NNW | 25% |
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 Sep 19, 2026.