Custer, MT Weather & Growing Conditions
Today
76°F
Sunny
Sunny, with a high near 76. Northwest wind 0 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 76°F | Sunny | 0 to 6 mph NW | 0% |
| Tonight | 52°F | Partly Cloudy | 0 to 5 mph E | 1% |
| Wednesday | 86°F | Sunny | 0 to 7 mph WSW | 0% |
| Wednesday Night | 56°F | Partly Cloudy | 0 to 6 mph N | 0% |
| Thursday | 93°F | Sunny | 0 to 8 mph W | 0% |
| Thursday Night | 59°F | Mostly Clear | 0 to 8 mph NNE | 0% |
| Friday | 98°F | Sunny | 0 to 7 mph WSW | 0% |
| Friday Night | 63°F | Mostly Clear | 2 to 9 mph NNE | 0% |
| Saturday | 96°F | Sunny | 3 to 12 mph NW | 0% |
| Saturday Night | 63°F | Partly Cloudy | 2 to 10 mph NE | 1% |
| Sunday | 93°F | Mostly Sunny | 2 to 12 mph N | 0% |
| Sunday Night | 64°F | Partly Cloudy | 6 to 10 mph NE | 6% |
| Monday | 90°F | Mostly Sunny | 5 to 12 mph NE | 5% |
| Monday Night | 63°F | Partly Cloudy | 7 to 10 mph ENE | 13% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Custer, MT
Last spring frost
May 22
First fall frost
Sep 22
Growing season
121 days
Hardiness zone
4b
Explore more for Custer, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Pompeys Pillar 15N, Mt (11 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.