Ulm, MT Weather & Growing Conditions
Tonight
51°F
Slight Chance Showers And Thunderstorms then Chance Rain
A slight chance of showers and thunderstorms between 8pm and 9pm, then a chance of rain. Cloudy, with a low around 51. North northeast wind 3 to 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Slight Chance Showers And Thunderstorms then Chance Rain | 3 to 10 mph NNE | 38% |
| Saturday | 66°F | Chance Light Rain | 3 to 8 mph NNE | 28% |
| Saturday Night | 47°F | Mostly Cloudy then Patchy Fog | 1 to 7 mph SSE | 8% |
| Sunday | 75°F | Patchy Fog then Mostly Sunny | 3 mph S | 2% |
| Sunday Night | 47°F | Mostly Clear | 2 to 7 mph SSE | 0% |
| Monday | 81°F | Sunny | 2 to 6 mph SSW | 0% |
| Monday Night | 49°F | Mostly Clear | 6 mph SSW | 0% |
| Tuesday | 79°F | Sunny | 5 mph WSW | 0% |
| Tuesday Night | 49°F | Mostly Clear | 2 to 7 mph SSE | 1% |
| Wednesday | 80°F | Sunny | 1 to 9 mph SW | 0% |
| Wednesday Night | 49°F | Mostly Clear | 2 to 7 mph SSW | 3% |
| Thursday | 81°F | Sunny | 1 to 6 mph SSW | 1% |
| Thursday Night | 50°F | Partly Cloudy | 7 mph S | 2% |
| Friday | 80°F | Mostly Sunny | 3 to 9 mph SW | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ulm, MT
Last spring frost
Jun 2
First fall frost
Sep 10
Growing season
96 days
Hardiness zone
4a
Explore more for Ulm, MT: full frost dates · planting calendar · Montana frost dates
Climate data from the nearest NOAA station, Sun Rvr 4 S, Mt (8.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.