Weather in Big Arm, MT
Updated 2026-08-11 11:00 local time · ZIP codes 59910
Sunny
No government weather alerts were returned for this location at the latest update.
Next hours
64°0% rain82°0% rain84°0% rain85°0% rain86°0% rain86°0% rain86°0% rain86°1% rain84°0% rain81°0% rain
77°0% rain75°0% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 1%).
It feels like 64°F with winds near 2 mph.
64°F, 0% rain chance and 2 mph wind.
Visibility is around 6 mi; gusts may reach 7 mph.
Current temperature is 64°F, wind 2 mph, rain chance up to 1%.
UV index is 3.
Big Arm weather today
Sunny and 64°F in Big Arm, MT. Today's high is 86°F with a 1% rain chance. Winds are around 2 mph with gusts near 7 mph. Relative humidity is 52%, pressure is 30.06 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Big Arm
Sunrise is at 06:27 AM and sunset is at 08:57 PM. Tomorrow's forecast calls for Sunny with a high near 82°F and a low near 52°F. The maximum rain chance is 57%.