Bynum, MT Weather & Growing Conditions
Overnight
42°F
Mostly Clear
Mostly clear. Low around 42, with temperatures rising to around 45 overnight. West wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 42°F | Mostly Clear | 2 mph W | 0% |
| Tuesday | 76°F | Mostly Sunny | 1 to 6 mph SSE | 1% |
| Tuesday Night | 49°F | Mostly Clear | 5 mph SW | 1% |
| Wednesday | 84°F | Sunny | 7 mph WNW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 6 mph WNW | 0% |
| Thursday | 90°F | Sunny | 5 to 9 mph WNW | 0% |
| Thursday Night | 54°F | Mostly Clear | 2 to 10 mph WNW | 0% |
| Friday | 95°F | Sunny | 2 to 17 mph WNW | 0% |
| Friday Night | 56°F | Mostly Clear | 8 to 16 mph W | 0% |
| Saturday | 91°F | Sunny | 5 to 10 mph W | 0% |
| Saturday Night | 55°F | Partly Cloudy | 6 to 12 mph WNW | 0% |
| Sunday | 85°F | Sunny | 8 mph N | 1% |
| Sunday Night | 54°F | Partly Cloudy | 5 to 9 mph N | 6% |
| Monday | 83°F | Sunny | 7 mph NNE | 9% |
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 Aug 4, 2026.