Forsyth, MT Weather & Growing Conditions
Tonight
57°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 3am, then patchy fog and a chance of showers and thunderstorms between 3am and 4am, then patchy fog and showers and thunderstorms likely. Mostly cloudy. Low around 57, with temperatures rising to around 59 overnight. North northeast wind around 8 mph. Chance of precipitation is 70%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Chance Showers And Thunderstorms | 8 mph NNE | 70% |
| Saturday | 63°F | Patchy Fog | 8 to 12 mph NE | 97% |
| Saturday Night | 52°F | Patchy Fog | 13 mph ENE | 91% |
| Sunday | 62°F | Rain Showers | 9 mph ENE | 76% |
| Sunday Night | 49°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 8 mph ESE | 21% |
| Monday | 70°F | Partly Sunny | 7 mph SE | 2% |
| Monday Night | 50°F | Mostly Clear | 6 to 10 mph SE | 0% |
| Tuesday | 77°F | Sunny | 3 mph SSE | 0% |
| Tuesday Night | 53°F | Partly Cloudy | 5 mph ESE | 4% |
| Wednesday | 79°F | Mostly Sunny | 3 mph SW | 4% |
| Wednesday Night | 53°F | Mostly Clear | 3 mph ESE | 4% |
| Thursday | 80°F | Sunny | 5 mph SE | 2% |
| Thursday Night | 54°F | Partly Cloudy | 7 mph ESE | 2% |
| Friday | 81°F | Mostly Sunny | 6 mph SE | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Forsyth, MT
Last spring frost
May 9
First fall frost
Sep 29
Growing season
142 days
Hardiness zone
4b
Explore more for Forsyth, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Forsyth, Mt (2.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.