Potomac, MT Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potomac, a community in Missoula County, Montana.
This Afternoon
75°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 75. West wind around 5 mph. Chance of precipitation is 30%.
7-day forecast for Potomac
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Chance Showers And Thunderstorms | 5 mph W | 31% |
| Tonight | 47°F | Showers And Thunderstorms | 2 mph N | 75% |
| Saturday | 70°F | Areas Of Fog | 1 mph SE | 45% |
| Saturday Night | 43°F | Partly Cloudy then Areas Of Fog | 0 mph | 4% |
| Sunday | 76°F | Areas Of Fog then Sunny | 1 mph W | 0% |
| Sunday Night | 44°F | Clear | 0 mph | 0% |
| Monday | 79°F | Sunny | 0 to 3 mph SW | 0% |
| Monday Night | 44°F | Mostly Clear | 0 mph | 0% |
| Tuesday | 78°F | Sunny | 2 mph W | 0% |
| Tuesday Night | 45°F | Mostly Clear | 0 mph | 1% |
| Wednesday | 77°F | Sunny | 2 mph W | 1% |
| Wednesday Night | 44°F | Mostly Clear | 1 mph NW | 2% |
| Thursday | 79°F | Sunny | 0 mph | 1% |
| Thursday Night | 45°F | Partly Cloudy | 0 mph | 2% |
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
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Piltzville
Seeley Lake
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Twin Creeks
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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 Sep 19, 2026.