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

Hazardous Weather Conditions

Winter Weather Advisory in effect from March 29, 08:00 PM MDT until March 30, 10:00 AM MDT

Current conditions at

ST. MARY (SRYM8)

Lat: 48.74108°NLon: 113.43289°WElev: 4557.0ft.

33°F

1°C

Humidity	74%
Wind Speed	SW 10 MPH
Barometer	NA
Dewpoint	26°F (-3°C)
Visibility	NA
Wind Chill	25°F (-4°C)
Last update	30 Mar 02:11 AM MDT

More Information:

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

Extended Forecast for

7 Miles S St Mary MT

Winter Weather Advisory until March 30, 10:00am

Click here for hazard details and duration

Winter Weather Advisory

Winter Weather Advisory until March 30, 10:00am
NOW until 10:00am Mon
Winter Weather Advisory
Overnight
Low: 21 °F
Heavy Snow
and Blowing
Snow
Monday
High: 16 °F⇓
Snow Likely
and Blowing
Snow
Monday Night
Low: 4 °F
Chance Snow
then Partly
Cloudy
Tuesday
High: 23 °F
Mostly Cloudy
Tuesday Night
Low: 15 °F
Mostly Cloudy
Wednesday
High: 31 °F
Partly Sunny
then Slight
Chance Snow
Wednesday Night
Low: 22 °F
Chance Snow
then Snow
Thursday
High: 24 °F
Heavy Snow
and Blustery

Detailed Forecast

Overnight

Snow. The snow could be heavy at times. Widespread blowing snow. Steady temperature around 21. Wind chill values as low as zero. Windy, with a west southwest wind 32 to 34 mph, with gusts as high as 48 mph. Chance of precipitation is 90%. Total nighttime snow accumulation of 3 to 7 inches possible.

Monday

Snow likely. Widespread blowing snow before noon. Mostly cloudy, with a temperature falling to around 14 by 4pm. Wind chill values as low as -5. Windy, with a west wind 29 to 34 mph decreasing to 22 to 27 mph in the afternoon. Winds could gust as high as 48 mph. Chance of precipitation is 70%. New snow accumulation of 2 to 4 inches possible.

Monday Night

A 40 percent chance of snow, mainly before 11pm. Partly cloudy, with a low around 4. Wind chill values as low as -15. Northwest wind 13 to 21 mph becoming south in the evening. Winds could gust as high as 29 mph. New snow accumulation of less than a half inch possible.

Tuesday

Mostly cloudy, with a high near 23. Wind chill values as low as -10. South wind 13 to 17 mph, with gusts as high as 24 mph.

Tuesday Night

Mostly cloudy, with a low around 15. South southwest wind 14 to 17 mph, with gusts as high as 24 mph.

Wednesday

A 20 percent chance of snow after noon. Partly sunny, with a high near 31. Southwest wind 15 to 17 mph, with gusts as high as 25 mph.

Wednesday Night

Snow, mainly after midnight. Low around 22. South southwest wind 9 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

Thursday

Snow. The snow could be heavy at times. Cloudy, with a high near 24. Blustery, with a west northwest wind 15 to 24 mph, with gusts as high as 38 mph.

Thursday Night

Snow likely. Mostly cloudy, with a low around 15. Blustery.

Friday

Snow likely, mainly before noon. Mostly cloudy, with a high near 25.

Friday Night

A chance of snow. Mostly cloudy, with a low around 17.

Saturday

A slight chance of snow. Partly sunny, with a high near 30.

Saturday Night

Partly cloudy, with a low around 22.