Dewey, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dewey, a community in Silver Bow County, Montana.
Overnight
28°F
Mostly Cloudy
Mostly cloudy, with a low around 28. East southeast wind around 3 mph.
7-day forecast for Dewey
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 28°F | Mostly Cloudy | 3 mph ESE | 0% |
| Wednesday | 51°F | Mostly Sunny | 1 to 5 mph SE | 0% |
| Wednesday Night | 28°F | Mostly Clear | 3 to 7 mph SW | 0% |
| Thursday | 45°F | Partly Sunny | 6 to 9 mph W | 7% |
| Thursday Night | 26°F | Partly Cloudy | 9 mph WSW | 7% |
| Friday | 48°F | Mostly Sunny | 8 to 12 mph WSW | 0% |
| Friday Night | 31°F | Partly Cloudy | 9 to 14 mph WSW | 0% |
| Saturday | 54°F | Mostly Sunny | 6 to 9 mph SW | 0% |
| Saturday Night | 33°F | Partly Cloudy | 7 to 14 mph SSW | 0% |
| Sunday | 56°F | Mostly Sunny | 8 to 15 mph SSW | 5% |
| Sunday Night | 33°F | Partly Cloudy | 6 to 10 mph WSW | 5% |
| Monday | 52°F | Mostly Sunny | 7 mph SW | 1% |
| Monday Night | 33°F | Mostly Cloudy | 6 to 9 mph SW | 1% |
| Tuesday | 54°F | Mostly Sunny | 7 to 10 mph WSW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Dewey (45.775, -112.853). Updated through the day.
Growing snapshot for Dewey
Last spring frost
Jun 10
First fall frost
Sep 7
Growing season
85 days
Hardiness zone
5a
More local growing data for Dewey: nearby ZIP 59727 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Divide, Mt (5 mi from Dewey). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.