National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Heat Wave Continues in the West; Critical Fire Weather Conditions in the High Plains

An anomalously early heat wave will continue to intensify and expand across the West and Southwest as the week progresses. Numerous daily and potentially monthly record highs are expected to be broken. Critical fire weather conditions will continue over the next couple of days across portions of the High Plains as gusty winds and dry conditions persist. Read More >

Hazardous Weather Conditions

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

43°F

6°C

Humidity 68%
Wind Speed NA 14 MPH
Barometer NA
Dewpoint 33°F (1°C)
Visibility NA
Wind Chill36°F (2°C)
Last update 17 Mar 11:10 PM MDT
Extended Forecast for

St Mary MT

High Wind Warning March 18, 06:00am until March 18, 09:00pm
Click here for hazard details and duration
High Wind Warning

  • Tonight

    Tonight: A 40 percent chance of rain, mainly after 3am. Mostly cloudy, with a low around 41. Breezy, with a southwest wind 16 to 23 mph, with gusts as high as 49 mph.

    Low: 41 °F

    Chance Rain
    and Breezy

  • Wednesday

    Wednesday: A 50 percent chance of rain, mainly before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 49. Breezy, with a west southwest wind 20 to 25 mph, with gusts as high as 55 mph.

    High: 49 °F

    Chance Rain
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42. Breezy, with a southwest wind 18 to 23 mph, with gusts as high as 48 mph.

    Low: 42 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Thursday

    Thursday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 53. Breezy, with a west southwest wind 23 to 25 mph, with gusts as high as 50 mph.

    High: 53 °F

    Breezy.
    Mostly Sunny
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain. Partly cloudy, with a low around 43. Breezy, with a west southwest wind 21 to 23 mph, with gusts as high as 47 mph.

    Low: 43 °F

    Slight Chance
    Rain and
    Breezy

  • Friday

    Friday: Rain likely, mainly after noon. Partly sunny, with a high near 52. Breezy, with a west southwest wind 16 to 23 mph, with gusts as high as 55 mph. Chance of precipitation is 60%.

    High: 52 °F

    Rain Likely
    and Breezy

  • Friday Night

    Friday Night: Rain likely before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 40. Southwest wind 14 to 20 mph, with gusts as high as 44 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 40 °F

    Rain Likely
    then Chance
    Rain/Snow

  • Saturday

    Saturday: A chance of rain and snow before noon, then a chance of snow. Partly sunny, with a high near 46. West southwest wind 10 to 13 mph, with gusts as high as 30 mph.

    High: 46 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Saturday Night

    Saturday Night: A slight chance of snow before midnight. Mostly clear, with a low around 26.

    Low: 26 °F

    Slight Chance
    Snow then
    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of rain, mainly after 3am. Mostly cloudy, with a low around 41. Breezy, with a southwest wind 16 to 23 mph, with gusts as high as 49 mph.
Wednesday
A 50 percent chance of rain, mainly before 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 49. Breezy, with a west southwest wind 20 to 25 mph, with gusts as high as 55 mph.
Wednesday Night
Partly cloudy, with a low around 42. Breezy, with a southwest wind 18 to 23 mph, with gusts as high as 48 mph.
Thursday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 53. Breezy, with a west southwest wind 23 to 25 mph, with gusts as high as 50 mph.
Thursday Night
A 20 percent chance of rain. Partly cloudy, with a low around 43. Breezy, with a west southwest wind 21 to 23 mph, with gusts as high as 47 mph.
Friday
Rain likely, mainly after noon. Partly sunny, with a high near 52. Breezy, with a west southwest wind 16 to 23 mph, with gusts as high as 55 mph. Chance of precipitation is 60%.
Friday Night
Rain likely before 3am, then a chance of rain and snow. Mostly cloudy, with a low around 40. Southwest wind 14 to 20 mph, with gusts as high as 44 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Saturday
A chance of rain and snow before noon, then a chance of snow. Partly sunny, with a high near 46. West southwest wind 10 to 13 mph, with gusts as high as 30 mph.
Saturday Night
A slight chance of snow before midnight. Mostly clear, with a low around 26.
Sunday
Sunny, with a high near 43.
Sunday Night
Mostly clear, with a low around 28.
Monday
Partly sunny, with a high near 44.
Monday Night
Mostly cloudy, with a low around 29.
Tuesday
A chance of rain and snow. Partly sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
St Mary MT
 48.74°N 113.44°W (Elev. 4554 ft)
Last Update:
10:42 pm MDT Mar 17, 2026
Forecast Valid:
11pm MDT Mar 17, 2026-6pm MDT Mar 24, 2026
 
Forecast Discussion
 
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