Spencer, MT Weather & Growing Conditions
Tonight
20°F
Mostly Cloudy then Patchy Fog
Patchy fog after 2am. Mostly cloudy. Low around 20, with temperatures rising to around 23 overnight. North wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 20°F | Mostly Cloudy then Patchy Fog | 0 to 3 mph N | 0% |
| Wednesday | 46°F | Patchy Fog then Mostly Sunny | 2 mph NW | 0% |
| Wednesday Night | 20°F | Patchy Fog | 1 to 5 mph SSE | 1% |
| Thursday | 39°F | Patchy Fog then Partly Sunny | 5 to 9 mph SSE | 9% |
| Thursday Night | 20°F | Mostly Cloudy | 1 to 5 mph SSE | 9% |
| Friday | 38°F | Mostly Sunny | 1 to 9 mph SSE | 5% |
| Friday Night | 21°F | Mostly Cloudy | 2 to 7 mph SSE | 5% |
| Saturday | 43°F | Mostly Sunny | 2 to 7 mph SSE | 0% |
| Saturday Night | 21°F | Partly Cloudy | 5 to 9 mph SE | 0% |
| Sunday | 46°F | Mostly Sunny | 6 to 12 mph SE | 0% |
| Sunday Night | 23°F | Mostly Cloudy | 3 to 8 mph SE | 0% |
| Monday | 47°F | Partly Sunny | 3 to 8 mph SE | 1% |
| Monday Night | 25°F | Mostly Cloudy | 6 mph SE | 3% |
| Tuesday | 47°F | Partly Sunny | 2 to 9 mph SSE | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Spencer, MT
Last spring frost
Jun 11
First fall frost
Sep 10
Growing season
89 days
Hardiness zone
5a
Explore more for Spencer, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Lima, Mt (19.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.