Swan Lake, MT Weather & Growing Conditions
Today
44°F
Mostly Sunny
Mostly sunny, with a high near 44. West wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 44°F | Mostly Sunny | 1 mph W | 0% |
| Tonight | 30°F | Mostly Clear | 1 mph SSE | 2% |
| Thursday | 41°F | Chance Rain And Snow | 0 to 5 mph SSW | 34% |
| Thursday Night | 33°F | Chance Rain And Snow then Mostly Cloudy | 3 mph SSW | 30% |
| Friday | 44°F | Partly Sunny then Slight Chance Light Rain | 2 to 7 mph SSW | 23% |
| Friday Night | 36°F | Slight Chance Light Rain | 2 to 7 mph SSW | 23% |
| Saturday | 51°F | Partly Sunny | 2 mph SSW | 4% |
| Saturday Night | 38°F | Partly Cloudy then Chance Light Rain | 0 to 3 mph SSE | 34% |
| Sunday | 52°F | Chance Light Rain | 3 to 14 mph S | 37% |
| Sunday Night | 37°F | Chance Light Rain | 0 to 7 mph SSW | 37% |
| Monday | 48°F | Partly Sunny then Chance Light Rain | 0 mph | 25% |
| Monday Night | 37°F | Chance Light Rain | 1 mph SSE | 25% |
| Tuesday | 50°F | Slight Chance Light Rain | 0 to 3 mph SSW | 23% |
| Tuesday Night | 38°F | Mostly Cloudy | 2 mph SSW | 21% |
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 Nov 4, 2026.