Potomac, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a community in Missoula County, Montana.
Overnight
40°F
Patchy Smoke
Patchy smoke. Mostly clear, with a low around 40. Wind around 0 mph.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 40°F | Patchy Smoke | 0 mph | 0% |
| Tuesday | 82°F | Patchy Smoke | 0 to 3 mph S | 0% |
| Tuesday Night | 45°F | Mostly Clear | 0 to 3 mph NNW | 0% |
| Wednesday | 87°F | Sunny then Patchy Smoke | 0 to 3 mph W | 0% |
| Wednesday Night | 47°F | Mostly Clear | 0 to 3 mph NW | 0% |
| Thursday | 94°F | Sunny | 0 to 5 mph WSW | 0% |
| Thursday Night | 50°F | Clear | 0 to 3 mph WNW | 0% |
| Friday | 97°F | Sunny | 0 to 7 mph WSW | 0% |
| Friday Night | 51°F | Mostly Clear | 1 to 12 mph W | 0% |
| Saturday | 94°F | Sunny | 0 to 7 mph WNW | 0% |
| Saturday Night | 51°F | Mostly Clear | 0 to 8 mph NW | 0% |
| Sunday | 91°F | Sunny | 0 to 5 mph WNW | 0% |
| Sunday Night | 50°F | Mostly Clear | 0 to 6 mph NW | 0% |
| Monday | 90°F | Sunny | 0 to 3 mph NW | 0% |
Forecast source: National Weather Service (api.weather.gov) for Potomac (46.881, -113.575). Updated through the day.
Growing snapshot for Potomac
Growing season
45 days
Hardiness zone
5b
More local growing data for Potomac: nearby ZIP 59823 weather · frost dates · planting calendar · Montana frost dates
Nearby towns & communities
Alberton
Arlee
Bonner-West Riverside
Condon
Cyr
East Missoula
Evaro
Frenchtown
Huson
Lolo
Missoula
Orchard Homes
Piltzville
Seeley Lake
Turah
Twin Creeks
Wye
Climate data from the nearest NOAA station, Potomac, Mt (6.6 mi from Potomac). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.