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

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

Lat: 48.74111°NLon: 113.43306°WElev: 4550.0ft.

35°F

2°C

Humidity	89%
Wind Speed	NA 0 MPH
Barometer	NA
Dewpoint	32°F (0°C)
Visibility	NA
Last update	19 Jun 06:10 AM MDT

More Information:

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

Extended Forecast for

5 Miles SW St Mary MT

Juneteenth
High: 71 °F
Mostly Sunny
Tonight
Low: 42 °F
Partly Cloudy
Saturday
High: 76 °F
Mostly Sunny
then Slight
Chance
Showers
Saturday Night
Low: 43 °F
Chance
Showers then
Partly Cloudy
Sunday
High: 62 °F
Slight Chance
Showers then
Showers
Likely
Sunday Night
Low: 38 °F
Showers
Likely then
Mostly Cloudy
Monday
High: 65 °F
Mostly Sunny
then Slight
Chance
T-storms
Monday Night
Low: 40 °F
Partly Cloudy
Tuesday
High: 74 °F
Sunny

Detailed Forecast

Juneteenth

Mostly sunny, with a high near 71. Calm wind becoming east southeast 5 to 7 mph in the morning.

Tonight

Partly cloudy, with a low around 42. East southeast wind 5 to 7 mph becoming light and variable.

Saturday

A 20 percent chance of showers after 5pm. Mostly sunny, with a high near 76. Southwest wind 6 to 14 mph, with gusts as high as 30 mph.

Saturday Night

A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 43. West southwest wind 9 to 14 mph becoming light and variable after midnight. Winds could gust as high as 29 mph.

Sunday

A slight chance of showers, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 62. North northwest wind 3 to 8 mph. Chance of precipitation is 70%.

Sunday Night

Showers likely and possibly a thunderstorm before 9pm, then showers likely between 9pm and midnight. Mostly cloudy, with a low around 38. North wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 18 mph. Chance of precipitation is 60%.

Monday

A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 65. Calm wind becoming north around 6 mph in the afternoon.

Monday Night

Partly cloudy, with a low around 40. North northeast wind around 6 mph becoming calm after midnight.

Tuesday

Sunny, with a high near 74.

Tuesday Night

Partly cloudy, with a low around 46.

Wednesday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 78.

Wednesday Night

Partly cloudy, with a low around 48.

Thursday

A slight chance of showers. Mostly sunny, with a high near 78.