Harman US

Spencer, MT Weather & Growing Conditions

Tonight
40°F
Showers And Thunderstorms
Showers and thunderstorms before 3am, then rain likely. Cloudy. Low around 40, with temperatures rising to around 43 overnight. East wind 2 to 6 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Tonight 40°F Showers And Thunderstorms 2 to 6 mph E 95%
Saturday 54°F Light Rain Likely then Showers And Thunderstorms Likely 2 to 8 mph SSE 70%
Saturday Night 37°F Chance Showers And Thunderstorms then Chance Light Rain 1 to 5 mph WNW 37%
Sunday 63°F Patchy Fog then Partly Sunny 1 to 6 mph WNW 6%
Sunday Night 34°F Partly Cloudy 1 to 5 mph NE 1%
Monday 68°F Sunny 1 to 5 mph SSE 1%
Monday Night 38°F Partly Cloudy 1 to 6 mph ESE 1%
Tuesday 68°F Mostly Sunny 0 to 5 mph SE 2%
Tuesday Night 38°F Partly Cloudy 1 to 6 mph ESE 7%
Wednesday 69°F Sunny 1 to 9 mph SE 3%
Wednesday Night 38°F Mostly Clear 3 to 9 mph ESE 1%
Thursday 71°F Sunny 3 to 12 mph SE 2%
Thursday Night 39°F Partly Cloudy 5 to 9 mph SE 3%
Friday 70°F Mostly Sunny 5 to 15 mph SSE 3%

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 Sep 19, 2026.