Harman US

Simms, MT Weather & Growing Conditions

Tonight
52°F
Cloudy then Chance Light Rain
A chance of rain after 1am. Cloudy, with a low around 52. North wind around 6 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Tonight 52°F Cloudy then Chance Light Rain 6 mph N 41%
Saturday 65°F Chance Light Rain then Cloudy 8 mph NNE 25%
Saturday Night 47°F Mostly Cloudy 2 to 8 mph SSE 2%
Sunday 73°F Mostly Sunny 7 mph S 0%
Sunday Night 49°F Mostly Clear 5 to 9 mph SSE 0%
Monday 78°F Sunny 6 to 10 mph SSW 0%
Monday Night 50°F Mostly Clear 8 mph SW 0%
Tuesday 77°F Sunny 8 mph SW 0%
Tuesday Night 50°F Partly Cloudy 5 to 8 mph SSW 0%
Wednesday 77°F Sunny 7 to 10 mph SW 1%
Wednesday Night 51°F Mostly Clear 6 to 10 mph SW 3%
Thursday 78°F Sunny 6 to 13 mph SSW 1%
Thursday Night 52°F Partly Cloudy 6 to 9 mph SSW 2%
Friday 77°F Mostly Sunny 8 to 15 mph SSW 2%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Simms, MT

Last spring frost
Jun 2
First fall frost
Sep 10
Growing season
96 days
Hardiness zone
4b

Explore more for Simms, MT: full frost dates · planting calendar · Montana frost dates

Climate data from the nearest NOAA station, Sun Rvr 4 S, Mt (11.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.