Custer, MT Weather & Growing Conditions
Today
49°F
Sunny
Sunny. High near 49, with temperatures falling to around 43 in the afternoon. West northwest wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Sunny | 3 mph WNW | 0% |
| Tonight | 30°F | Partly Cloudy | 2 mph SSE | 0% |
| Thursday | 52°F | Mostly Sunny | 2 mph SSW | 0% |
| Thursday Night | 34°F | Mostly Cloudy | 1 mph WSW | 4% |
| Friday | 52°F | Sunny | 1 to 9 mph SW | 0% |
| Friday Night | 35°F | Partly Cloudy | 3 to 9 mph SW | 0% |
| Saturday | 57°F | Sunny | 2 to 8 mph WSW | 0% |
| Saturday Night | 35°F | Mostly Clear | 3 mph S | 0% |
| Sunday | 63°F | Mostly Sunny | 2 to 6 mph WSW | 0% |
| Sunday Night | 38°F | Partly Cloudy | 2 mph NW | 0% |
| Monday | 56°F | Mostly Sunny | 0 to 3 mph NNW | 2% |
| Monday Night | 35°F | Partly Cloudy | 2 mph SSE | 2% |
| Tuesday | 59°F | Mostly Sunny | 2 to 6 mph SW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 2 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Custer, MT
Last spring frost
May 26
First fall frost
Sep 16
Growing season
111 days
Hardiness zone
4b
Explore more for Custer, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Hysham 25 Sse, Mt (8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.