Bynum, MT Weather & Growing Conditions
Overnight
31°F
Mostly Cloudy
Mostly cloudy, with a low around 31. West northwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 31°F | Mostly Cloudy | 3 mph WNW | 0% |
| Wednesday | 50°F | Mostly Sunny | 2 mph NE | 0% |
| Wednesday Night | 30°F | Mostly Clear | 3 mph SW | 0% |
| Thursday | 51°F | Partly Sunny | 3 to 9 mph WSW | 0% |
| Thursday Night | 32°F | Partly Cloudy | 7 mph WSW | 0% |
| Friday | 53°F | Mostly Sunny | 6 to 9 mph SW | 1% |
| Friday Night | 38°F | Mostly Cloudy | 5 to 13 mph SW | 2% |
| Saturday | 59°F | Mostly Sunny | 6 mph SW | 2% |
| Saturday Night | 39°F | Mostly Cloudy | 3 to 7 mph SSW | 0% |
| Sunday | 60°F | Partly Sunny | 7 to 14 mph SW | 1% |
| Sunday Night | 36°F | Mostly Cloudy | 2 to 8 mph W | 1% |
| Monday | 53°F | Partly Sunny | 5 mph SSW | 1% |
| Monday Night | 36°F | Mostly Cloudy | 5 mph SSW | 1% |
| Tuesday | 56°F | Partly Sunny | 5 to 8 mph SW | 3% |
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 Nov 4, 2026.