Bynum, MT Weather & Growing Conditions
This Afternoon
70°F
Partly Sunny
Partly sunny, with a high near 70. North northeast wind around 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Partly Sunny | 8 mph NNE | 5% |
| Tonight | 50°F | Mostly Cloudy | 7 mph NNW | 10% |
| Saturday | 66°F | Partly Sunny | 6 mph NE | 10% |
| Saturday Night | 47°F | Mostly Cloudy | 2 to 6 mph S | 0% |
| Sunday | 73°F | Sunny | 2 to 6 mph S | 0% |
| Sunday Night | 48°F | Mostly Clear | 2 to 6 mph S | 0% |
| Monday | 77°F | Sunny | 3 mph SW | 0% |
| Monday Night | 50°F | Mostly Clear | 3 mph W | 0% |
| Tuesday | 75°F | Sunny | 5 mph WSW | 0% |
| Tuesday Night | 50°F | Mostly Clear | 5 mph WSW | 1% |
| Wednesday | 75°F | Sunny | 2 to 6 mph WSW | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph WSW | 2% |
| Thursday | 76°F | Mostly Sunny | 2 to 7 mph SSW | 2% |
| Thursday Night | 50°F | Partly Cloudy | 2 to 6 mph WSW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Bynum, MT
Last spring frost
May 16
First fall frost
Sep 27
Growing season
133 days
Hardiness zone
4b
Explore more for Bynum, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Bynum 4 Sse, Mt (3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.