Harman US

Simms, MT Weather & Growing Conditions

Today
66°F
Slight Chance Light Rain then Mostly Cloudy
A slight chance of rain before noon. Mostly cloudy, with a high near 66. North northeast wind around 8 mph. Chance of precipitation is 20%.

7-day forecast

WhenTempForecastWindPrecip
Today 66°F Slight Chance Light Rain then Mostly Cloudy 8 mph NNE 18%
Tonight 46°F Mostly Cloudy 2 to 8 mph SSE 2%
Sunday 73°F Mostly Sunny 7 mph S 0%
Sunday Night 47°F Mostly Clear 5 to 8 mph SSE 0%
Monday 78°F Sunny 7 to 12 mph SSW 0%
Monday Night 49°F Mostly Clear 6 to 9 mph SW 0%
Tuesday 78°F Sunny 5 to 9 mph SW 0%
Tuesday Night 50°F Mostly Clear 7 mph SW 1%
Wednesday 79°F Sunny 6 to 10 mph SSW 1%
Wednesday Night 51°F Mostly Clear 7 to 10 mph SW 3%
Thursday 79°F Sunny 7 to 14 mph SSW 1%
Thursday Night 51°F Partly Cloudy 6 to 10 mph SSW 5%
Friday 75°F Mostly Sunny 8 to 14 mph SSW 6%
Friday Night 47°F Chance Light Rain 8 to 12 mph W 25%

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.