St. Ignatius, MT Weather & Growing Conditions
Today
75°F
Patchy Smoke then Sunny
Patchy smoke between 11am and noon. Sunny, with a high near 75. West northwest wind 1 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Patchy Smoke then Sunny | 1 to 7 mph WNW | 0% |
| Tonight | 57°F | Mostly Clear | 6 mph NE | 0% |
| Wednesday | 82°F | Sunny | 5 mph WSW | 0% |
| Wednesday Night | 60°F | Clear | 5 mph ESE | 0% |
| Thursday | 88°F | Sunny | 5 mph SSW | 0% |
| Thursday Night | 65°F | Clear | 6 mph SSW | 0% |
| Friday | 89°F | Sunny | 3 to 7 mph SW | 0% |
| Friday Night | 65°F | Clear | 5 to 13 mph SW | 0% |
| Saturday | 86°F | Sunny | 9 mph SW | 0% |
| Saturday Night | 64°F | Mostly Clear | 3 to 10 mph SW | 0% |
| Sunday | 83°F | Sunny | 2 to 6 mph SW | 0% |
| Sunday Night | 62°F | Mostly Clear | 2 to 7 mph NE | 0% |
| Monday | 82°F | Sunny | 1 to 6 mph W | 0% |
| Monday Night | 61°F | Mostly Clear | 2 to 7 mph ENE | 2% |
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 Aug 4, 2026.