Custer, MT Weather & Growing Conditions
Today
61°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a high near 61. North northeast wind around 12 mph. Chance of precipitation is 100%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Showers And Thunderstorms | 12 mph NNE | 99% |
| Tonight | 50°F | Patchy Fog | 6 to 10 mph NE | 93% |
| Sunday | 61°F | Rain Showers | 8 mph NNE | 80% |
| Sunday Night | 48°F | Chance Rain Showers then Areas Of Fog | 0 to 5 mph E | 25% |
| Monday | 71°F | Patchy Fog then Mostly Sunny | 3 mph SSE | 0% |
| Monday Night | 48°F | Mostly Clear | 5 mph SE | 0% |
| Tuesday | 77°F | Sunny | 2 mph SSW | 0% |
| Tuesday Night | 52°F | Partly Cloudy | 2 mph ESE | 6% |
| Wednesday | 79°F | Mostly Sunny | 0 to 3 mph SW | 7% |
| Wednesday Night | 52°F | Partly Cloudy | 2 mph SSE | 5% |
| Thursday | 81°F | Sunny | 1 to 5 mph WSW | 1% |
| Thursday Night | 53°F | Mostly Clear | 5 mph ESE | 0% |
| Friday | 81°F | Mostly Sunny | 3 mph S | 0% |
| Friday Night | 51°F | Partly Cloudy | 3 mph SE | 7% |
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 Sep 19, 2026.