Simms, MT Weather & Growing Conditions
Overnight
29°F
Mostly Cloudy
Mostly cloudy, with a low around 29. Southwest wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 29°F | Mostly Cloudy | 5 mph SW | 0% |
| Wednesday | 49°F | Mostly Sunny | 3 mph SSW | 0% |
| Wednesday Night | 31°F | Mostly Clear | 2 to 16 mph S | 0% |
| Thursday | 52°F | Mostly Sunny | 13 to 18 mph SW | 0% |
| Thursday Night | 33°F | Partly Cloudy | 15 mph SW | 0% |
| Friday | 52°F | Mostly Sunny | 15 to 28 mph SSW | 0% |
| Friday Night | 40°F | Mostly Cloudy | 17 to 25 mph SW | 0% |
| Saturday | 58°F | Mostly Sunny | 10 to 17 mph SSW | 0% |
| Saturday Night | 41°F | Partly Cloudy | 10 to 22 mph SSW | 0% |
| Sunday | 61°F | Mostly Sunny | 14 to 26 mph SW | 0% |
| Sunday Night | 38°F | Partly Cloudy | 9 to 14 mph SW | 0% |
| Monday | 54°F | Mostly Sunny | 10 mph SSW | 0% |
| Monday Night | 39°F | Mostly Cloudy | 8 to 15 mph SSW | 0% |
| Tuesday | 57°F | Mostly Sunny | 13 to 22 mph SW | 1% |
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 Nov 4, 2026.