Thompson Falls, MT Weather & Growing Conditions
Overnight
46°F
Mostly Cloudy
Mostly cloudy, with a low around 46. North northeast wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 46°F | Mostly Cloudy | 6 mph NNE | 1% |
| Saturday | 62°F | Mostly Sunny | 3 mph ESE | 2% |
| Saturday Night | 46°F | Partly Cloudy | 5 mph W | 4% |
| Sunday | 63°F | Sunny | 3 mph SW | 0% |
| Sunday Night | 47°F | Clear | 3 mph WSW | 0% |
| Monday | 64°F | Sunny | 6 mph S | 0% |
| Monday Night | 48°F | Mostly Clear | 6 mph WSW | 0% |
| Tuesday | 63°F | Sunny | 5 mph SSW | 0% |
| Tuesday Night | 47°F | Partly Cloudy | 5 mph SW | 1% |
| Wednesday | 61°F | Mostly Sunny | 5 to 8 mph SSW | 0% |
| Wednesday Night | 46°F | Partly Cloudy | 7 mph SW | 3% |
| Thursday | 60°F | Mostly Sunny | 5 mph SW | 1% |
| Thursday Night | 47°F | Partly Cloudy | 5 mph NW | 4% |
| Friday | 57°F | Partly Sunny | 6 mph SSW | 9% |
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 Sep 19, 2026.