National Weather Service

News Headlines

The Regional Temperatures and Precipitation Product for the State of Montana (RTPMT) will be discontinued on May 6, 2026.

Current conditions at

Karst US-191 MP 55.3 (MTKAR)

Lat: 45.34534°NLon: 111.17261°WElev: 5699.0ft.

unknown precip

18°F

-8°C

Humidity	96%
Wind Speed	S 0 MPH
Barometer	NA
Dewpoint	17°F (-8°C)
Visibility	NA
Last update	17 Apr 07:00 AM MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

6 Miles ESE Big Sky MT

Today
High: 29 °F
Chance Snow
Tonight
Low: 15 °F
Chance Snow
Showers then
Partly Cloudy
Saturday
High: 44 °F
Sunny
Saturday Night
Low: 25 °F
Mostly Clear
Sunday
High: 55 °F
Sunny
Sunday Night
Low: 34 °F
Mostly Cloudy
Monday
High: 60 °F
Mostly Sunny
Monday Night
Low: 38 °F
Partly Cloudy
Tuesday
High: 62 °F
Mostly Sunny

Detailed Forecast

Today

A chance of snow before 10am, then a chance of snow showers after 10am. Some thunder is also possible. Partly sunny, with a high near 29. Calm wind becoming west northwest 5 to 9 mph in the morning. Chance of precipitation is 50%. Total daytime snow accumulation of 1 to 2 inches possible.

Tonight

A 40 percent chance of snow showers, mainly before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 15. West northwest wind 5 to 7 mph becoming calm in the evening. New snow accumulation of less than one inch possible.

Saturday

Sunny, with a high near 44. Calm wind becoming southwest 5 to 8 mph in the afternoon.

Saturday Night

Mostly clear, with a low around 25. South southwest wind 3 to 7 mph. Winds could gust as high as 18 mph.

Sunday

Sunny, with a high near 55. South wind 3 to 7 mph.

Sunday Night

Mostly cloudy, with a low around 34. South wind 3 to 6 mph.

Monday

Mostly sunny, with a high near 60. Calm wind becoming southwest 5 to 8 mph in the afternoon.

Monday Night

Partly cloudy, with a low around 38. South wind 3 to 6 mph.