Dewey, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Dewey, a community in Silver Bow County, Montana.
Today
77°F
Areas Of Smoke
Areas of smoke. Sunny, with a high near 77. East wind 5 to 10 mph.
7-day forecast for Dewey
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Areas Of Smoke | 5 to 10 mph E | 0% |
| Tonight | 46°F | Patchy Smoke | 5 to 13 mph NNW | 1% |
| Wednesday | 84°F | Areas Of Smoke | 3 to 13 mph W | 0% |
| Wednesday Night | 50°F | Patchy Smoke then Mostly Clear | 7 to 14 mph W | 0% |
| Thursday | 90°F | Sunny | 5 to 16 mph W | 0% |
| Thursday Night | 53°F | Mostly Clear | 7 to 16 mph W | 0% |
| Friday | 94°F | Sunny | 6 to 22 mph WSW | 0% |
| Friday Night | 54°F | Mostly Clear | 8 to 22 mph WNW | 0% |
| Saturday | 91°F | Sunny | 6 to 21 mph W | 0% |
| Saturday Night | 54°F | Mostly Clear | 5 to 17 mph WNW | 1% |
| Sunday | 89°F | Sunny | 5 to 14 mph W | 1% |
| Sunday Night | 53°F | Mostly Clear | 5 to 14 mph NNW | 0% |
| Monday | 88°F | Sunny | 2 to 12 mph W | 1% |
| Monday Night | 52°F | Mostly Clear | 5 to 14 mph NNW | 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 Aug 4, 2026.