Weather in Big Arm, MT
Updated 2026-09-26 07:45 local time · ZIP codes 59910
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
42°22% rain
46°13% rain48°12% rain50°11% rain53°10% rain54°10% rain55°9% rain
57°3% rain58°2% rain59°4% rain57°3% rain
53°1% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 21%).
It feels like 36°F with winds near 11 mph.
58°F, 2% rain chance and 9 mph wind.
Visibility is around 6 mi; gusts may reach 25 mph.
Current temperature is 42°F, wind 11 mph, rain chance up to 21%.
UV index is 0.
Local weather characteristics in Big Arm
Montana weather varies from relatively dry plains to snowy mountain climates. Cold fronts, strong winds and large day-to-day temperature swings are common.
Big Arm is part of the West weather region. The forecast point is near 47.80°N latitude and 114.29°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Big Arm weather today
Overcast and 42°F in Big Arm, MT. Today's high is 59°F with a 17% rain chance. Winds are around 11 mph with gusts near 23 mph. Relative humidity is 76%, pressure is 30.05 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Big Arm
Sunrise is at 07:29 AM and sunset is at 07:27 PM. Tomorrow's forecast calls for Overcast with a high near 55°F and a low near 37°F. The maximum rain chance is 11%.