Grenora, MT Weather & Growing Conditions
This Afternoon
52°F
Sunny
Sunny. High near 52, with temperatures falling to around 45 in the afternoon. North wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 52°F | Sunny | 8 mph N | 0% |
| Tonight | 26°F | Patchy Fog | 6 mph ENE | 0% |
| Thursday | 47°F | Patchy Fog then Mostly Sunny | 5 to 13 mph SE | 0% |
| Thursday Night | 30°F | Mostly Cloudy | 8 mph SSW | 0% |
| Friday | 52°F | Mostly Sunny | 8 to 14 mph WSW | 0% |
| Friday Night | 33°F | Partly Cloudy | 8 to 12 mph SW | 0% |
| Saturday | 57°F | Mostly Sunny | 6 to 15 mph WSW | 0% |
| Saturday Night | 31°F | Partly Cloudy | 3 to 7 mph WSW | 0% |
| Sunday | 60°F | Mostly Sunny | 7 to 15 mph SSW | 0% |
| Sunday Night | 38°F | Partly Cloudy | 10 mph WSW | 0% |
| Monday | 55°F | Mostly Sunny | 7 to 15 mph W | 0% |
| Monday Night | 31°F | Partly Cloudy | 7 mph WSW | 1% |
| Tuesday | 55°F | Mostly Sunny | 5 to 12 mph S | 0% |
| Tuesday Night | 34°F | Partly Cloudy | 8 mph SSW | 4% |
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 Nov 5, 2026.