Custer, MT Weather & Growing Conditions
Today
76°F
Sunny
Sunny, with a high near 76. Northwest wind 1 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Sunny | 1 to 5 mph NW | 0% |
| Tonight | 51°F | Partly Cloudy | 2 to 6 mph E | 1% |
| Wednesday | 86°F | Sunny | 2 to 6 mph WSW | 0% |
| Wednesday Night | 55°F | Mostly Clear | 1 to 5 mph E | 0% |
| Thursday | 92°F | Sunny | 1 to 7 mph WSW | 0% |
| Thursday Night | 59°F | Mostly Clear | 1 to 6 mph ENE | 0% |
| Friday | 98°F | Sunny | 1 to 6 mph SW | 0% |
| Friday Night | 62°F | Partly Cloudy | 2 to 8 mph N | 0% |
| Saturday | 96°F | Sunny | 2 to 9 mph WNW | 0% |
| Saturday Night | 64°F | Partly Cloudy | 3 to 8 mph NE | 1% |
| Sunday | 94°F | Mostly Sunny | 2 to 9 mph NNE | 0% |
| Sunday Night | 63°F | Partly Cloudy | 5 to 8 mph NE | 9% |
| Monday | 91°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Monday Night | 63°F | Partly Cloudy | 9 mph ENE | 12% |
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 Aug 4, 2026.