Custer, MT Weather & Growing Conditions
Today
49°F
Mostly Sunny
Mostly sunny. High near 49, with temperatures falling to around 44 in the afternoon. Northwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 49°F | Mostly Sunny | 5 mph NW | 0% |
| Tonight | 31°F | Patchy Fog | 3 to 7 mph SE | 0% |
| Thursday | 53°F | Sunny | 2 to 7 mph SW | 0% |
| Thursday Night | 32°F | Mostly Cloudy | 1 to 5 mph SE | 4% |
| Friday | 52°F | Sunny | 1 to 7 mph SW | 0% |
| Friday Night | 35°F | Mostly Clear | 6 mph SSW | 0% |
| Saturday | 57°F | Sunny | 1 to 8 mph SW | 0% |
| Saturday Night | 36°F | Mostly Clear | 3 mph S | 0% |
| Sunday | 63°F | Mostly Sunny | 2 to 6 mph SW | 0% |
| Sunday Night | 38°F | Mostly Cloudy | 2 mph WNW | 1% |
| Monday | 57°F | Mostly Sunny | 0 to 5 mph ENE | 1% |
| Monday Night | 36°F | Mostly Cloudy | 2 mph SE | 1% |
| Tuesday | 59°F | Mostly Sunny | 1 to 6 mph SW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 3 mph SSW | 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.