Grenora, MT Weather & Growing Conditions
Today
68°F
Mostly Cloudy
Mostly cloudy, with a high near 68. Northeast wind 14 to 18 mph, with gusts as high as 26 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 68°F | Mostly Cloudy | 14 to 18 mph NE | 1% |
| Tonight | 49°F | Mostly Cloudy | 12 to 15 mph E | 13% |
| Sunday | 64°F | Mostly Cloudy | 13 mph ESE | 10% |
| Sunday Night | 47°F | Partly Cloudy | 9 mph SE | 1% |
| Monday | 71°F | Mostly Sunny | 7 to 18 mph SSE | 1% |
| Monday Night | 50°F | Mostly Clear | 16 mph SSE | 1% |
| Tuesday | 75°F | Mostly Sunny | 15 to 21 mph SSE | 2% |
| Tuesday Night | 53°F | Mostly Clear | 10 to 18 mph SSE | 2% |
| Wednesday | 79°F | Mostly Sunny | 12 mph SSE | 5% |
| Wednesday Night | 54°F | Partly Cloudy | 6 to 10 mph SE | 9% |
| Thursday | 81°F | Mostly Sunny | 6 to 13 mph SSE | 2% |
| Thursday Night | 55°F | Mostly Clear | 12 mph SE | 4% |
| Friday | 80°F | Mostly Sunny | 10 to 20 mph SE | 4% |
| Friday Night | 54°F | Partly Cloudy | 16 to 20 mph SE | 11% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Grenora, MT
Last spring frost
May 16
First fall frost
Sep 18
Growing season
125 days
Hardiness zone
3b
Explore more for Grenora, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Medicine Lake 3 Se, Mt (14.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.