Swan Lake, MT Weather & Growing Conditions
Tonight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. North northwest wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Cloudy | 2 mph NNW | 10% |
| Saturday | 70°F | Mostly Sunny | 2 mph NE | 9% |
| Saturday Night | 49°F | Partly Cloudy | 2 mph ESE | 0% |
| Sunday | 71°F | Sunny | 2 mph SW | 0% |
| Sunday Night | 50°F | Clear | 2 mph SE | 0% |
| Monday | 73°F | Sunny | 2 mph SSW | 0% |
| Monday Night | 51°F | Mostly Clear | 1 mph SSE | 0% |
| Tuesday | 71°F | Sunny | 2 mph SSW | 0% |
| Tuesday Night | 50°F | Mostly Clear | 1 mph SSE | 1% |
| Wednesday | 69°F | Sunny | 0 to 3 mph S | 1% |
| Wednesday Night | 50°F | Partly Cloudy | 1 mph SE | 3% |
| Thursday | 72°F | Sunny | 1 mph SSW | 2% |
| Thursday Night | 51°F | Partly Cloudy | 2 mph ENE | 1% |
| Friday | 71°F | Mostly Sunny | 2 mph S | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Swan Lake, MT
Last spring frost
May 17
First fall frost
Sep 19
Growing season
121 days
Hardiness zone
5b
Explore more for Swan Lake, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Swan Lake, Mt (4.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.