National Weather Service

News Headlines

SCN26-50: Discontinuation of the State Forecast Product (SFP) for all NWS Central Region, Southern Region, and Western Region Offices: Effective June 29, 2026
The Regional Temperatures and Precipitation Product for the State of Montana (RTPMT) will now be discontinued on July 7, 2026.

Current conditions at

Karst US-191 MP 55.3 (MTKAR)

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

unknown precip

50°F

10°C

Humidity	72%
Wind Speed	SSE 0 MPH
Barometer	NA
Dewpoint	41°F (5°C)
Visibility	NA
Last update	19 Jun 12:00 AM MDT

More Information:

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

Extended Forecast for

12 Miles NE Big Sky MT

Overnight
Low: 39 °F
Partly Cloudy
Juneteenth
High: 70 °F
Mostly Cloudy
Friday Night
Low: 47 °F
Mostly Cloudy
Saturday
High: 67 °F
Chance
Showers then
Showers
Saturday Night
Low: 45 °F
Showers then
Chance
Showers
Sunday
High: 65 °F
Chance
Showers then
Chance
T-storms
Sunday Night
Low: 41 °F
Chance
T-storms then
Partly Cloudy
Monday
High: 62 °F
Partly Sunny
then Slight
Chance
T-storms
Monday Night
Low: 40 °F
Mostly Clear

Detailed Forecast

Overnight

Partly cloudy, with a low around 39. Calm wind.

Juneteenth

Mostly cloudy, with a high near 70. Calm wind becoming west northwest around 6 mph in the afternoon.

Friday Night

Mostly cloudy, with a low around 47. North northwest wind around 5 mph becoming calm in the evening.

Saturday

A chance of showers before noon, then a slight chance of showers and thunderstorms between noon and 1pm, then showers and possibly a thunderstorm after 1pm. High near 67. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 80%.

Saturday Night

Showers and possibly a thunderstorm. Low around 45. Light and variable wind. Chance of precipitation is 80%.

Sunday

A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 65. Calm wind becoming west northwest around 6 mph in the afternoon. Chance of precipitation is 50%.

Sunday Night

A 30 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 41. Northwest wind around 6 mph becoming calm in the evening.

Monday

A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 62. Calm wind becoming north northwest 5 to 8 mph in the afternoon.

Monday Night

Mostly clear, with a low around 40.

Tuesday

Sunny, with a high near 71.

Tuesday Night

Mostly clear, with a low around 46.

Wednesday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 73.

Wednesday Night

Partly cloudy, with a low around 47.

Thursday

Sunny, with a high near 74.