Thompson Falls, MT Weather & Growing Conditions
Tonight
27°F
Mostly Cloudy
Mostly cloudy, with a low around 27. North northeast wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 27°F | Mostly Cloudy | 2 mph NNE | 0% |
| Wednesday | 41°F | Mostly Sunny | 2 mph SW | 0% |
| Wednesday Night | 29°F | Partly Cloudy | 2 to 8 mph SSW | 13% |
| Thursday | 33°F | Chance Light Snow | 8 mph SW | 44% |
| Thursday Night | 30°F | Mostly Cloudy | 6 to 10 mph SSW | 8% |
| Friday | 38°F | Partly Sunny then Slight Chance Rain And Snow | 9 mph SSW | 23% |
| Friday Night | 35°F | Slight Chance Rain And Snow | 7 to 12 mph SSW | 23% |
| Saturday | 44°F | Partly Sunny | 3 to 8 mph S | 5% |
| Saturday Night | 38°F | Mostly Cloudy then Chance Light Rain | 3 to 13 mph SSE | 49% |
| Sunday | 43°F | Chance Rain And Snow | 9 to 13 mph SW | 49% |
| Sunday Night | 34°F | Slight Chance Rain And Snow | 6 to 12 mph SW | 23% |
| Monday | 40°F | Mostly Cloudy then Chance Rain And Snow | 6 mph SSE | 27% |
| Monday Night | 36°F | Chance Rain And Snow | 3 to 8 mph SSW | 27% |
| Tuesday | 42°F | Slight Chance Light Snow then Chance Rain And Snow | 3 to 7 mph SW | 28% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Thompson Falls, MT
Last spring frost
May 7
First fall frost
Oct 4
Growing season
150 days
Hardiness zone
6a
Explore more for Thompson Falls, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Thompson Falls Ph, Mt (6.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.