Heat Persists in the South Central U.S. and Southwest; Heavy rains in the Desert Southwest and Central Plains

Sweltering heat remains across the South-Central Plains, Lower/Middle Mississippi Valley, and the Southwest this week with limited nighttime relief. Thunderstorms will bring heavy rainfall leading to localized flash flooding in portions of the Desert Southwest and central Plains. Isolated strong to severe thunderstorms are possible across portions of the central Plains into the Northeast. Read More >

Current conditions at

ST. MARY (SRYM8)

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

NA

53°F

12°C

Humidity 68%
Wind Speed SSW 10 MPH
Barometer NA
Dewpoint 43°F (6°C)
Visibility NA
Last update 09 Sep 07:11 AM MDT
Extended Forecast for

St Mary MT

  • Today

    Today: Sunny, with a high near 61. West southwest wind 15 to 20 mph, with gusts as high as 37 mph.

    High: 61 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 48. Breezy, with a southwest wind 20 to 23 mph, with gusts as high as 46 mph.

    Low: 48 °F

    Mostly Cloudy
    and Breezy

  • Thursday

    Thursday: Mostly sunny, with a high near 64. Breezy, with a west southwest wind 20 to 23 mph, with gusts as high as 47 mph.

    High: 64 °F

    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Showers likely, mainly after midnight.  Mostly cloudy, with a low around 38. West wind 10 to 15 mph becoming light and variable  after midnight. Winds could gust as high as 32 mph.  Chance of precipitation is 70%.

    Low: 38 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Showers, mainly before noon.  High near 50. North northeast wind 3 to 6 mph.  Chance of precipitation is 80%.

    High: 50 °F

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: Rain likely, mainly after midnight.  Cloudy, with a low around 35. Northeast wind around 7 mph.  Chance of precipitation is 70%.

    Low: 35 °F

    Chance Rain
    then Rain
    Likely

  • Saturday

    Saturday: Rain.  High near 44. East northeast wind 7 to 9 mph.  Chance of precipitation is 80%.

    High: 44 °F

    Rain

  • Saturday Night

    Saturday Night: Showers likely.  Mostly cloudy, with a low around 32. East wind 7 to 9 mph, with gusts as high as 21 mph.

    Low: 32 °F

    Showers
    Likely

  • Sunday

    Sunday: Rain and snow showers likely before 3pm, then a chance of rain showers.  Mostly cloudy, with a high near 47.

    High: 47 °F

    Rain/Snow
    Likely

Detailed Forecast

Today
Sunny, with a high near 61. West southwest wind 15 to 20 mph, with gusts as high as 37 mph.
Tonight
Mostly cloudy, with a low around 48. Breezy, with a southwest wind 20 to 23 mph, with gusts as high as 46 mph.
Thursday
Mostly sunny, with a high near 64. Breezy, with a west southwest wind 20 to 23 mph, with gusts as high as 47 mph.
Thursday Night
Showers likely, mainly after midnight. Mostly cloudy, with a low around 38. West wind 10 to 15 mph becoming light and variable after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 70%.
Friday
Showers, mainly before noon. High near 50. North northeast wind 3 to 6 mph. Chance of precipitation is 80%.
Friday Night
Rain likely, mainly after midnight. Cloudy, with a low around 35. Northeast wind around 7 mph. Chance of precipitation is 70%.
Saturday
Rain. High near 44. East northeast wind 7 to 9 mph. Chance of precipitation is 80%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 32. East wind 7 to 9 mph, with gusts as high as 21 mph.
Sunday
Rain and snow showers likely before 3pm, then a chance of rain showers. Mostly cloudy, with a high near 47.
Sunday Night
A chance of showers, mainly before midnight. Mostly cloudy, with a low around 32.
Monday
A slight chance of showers. Mostly sunny, with a high near 51.
Monday Night
A chance of showers. Partly cloudy, with a low around 34.
Tuesday
A chance of showers. Partly sunny, with a high near 50.
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ABOUT THIS FORECAST

 
Point Forecast:
St Mary MT
 48.74°N 113.41°W (Elev. 4895 ft)
12:31 am MDT Sep 9, 2026
7am MDT Sep 9, 2026-6pm MDT Sep 15, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database