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

Heat Persists in the South Central U.S. and California; Heavy Rain in the Ohio Valley

Sweltering heat remains across the South-Central Plains and Lower/Middle Mississippi Valley, as well as in the Southwest and California this week with limited nighttime relief. Heavy rainfall will lead to localized areas of flash flooding in parts of the Ohio Valley/Central Appalachians. Dry and breezy conditions will enhance fire weather concerns across the northern Rockies and High Plains. Read More >

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

61°F

16°C

Humidity 39%
Wind Speed NA 12 MPH
Barometer NA
Dewpoint 36°F (2°C)
Visibility NA
Last update 09 Sep 10:10 PM MDT
Extended Forecast for

St Mary MT

  • Tonight

    Tonight: Mostly cloudy, with a low around 48. Southwest wind around 17 mph, with gusts as high as 34 mph.

    Low: 48 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 66. Breezy, with a west southwest wind 16 to 22 mph, with gusts as high as 46 mph.

    High: 66 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Thursday Night

    Thursday Night: Showers likely, mainly after 3am. Cloudy, with a low around 37. West wind 9 to 14 mph becoming light and variable in the evening. Winds could gust as high as 26 mph. Chance of precipitation is 60%.

    Low: 37 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 50. Calm wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 90%.

    High: 50 °F

    Showers then
    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly after midnight. Cloudy, with a low around 34. Northeast wind 3 to 5 mph. Chance of precipitation is 70%.

    Low: 34 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers. High near 46. East northeast wind 5 to 7 mph. Chance of precipitation is 80%.

    High: 46 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely. Mostly cloudy, with a low around 32. East northeast wind around 6 mph. Chance of precipitation is 70%.

    Low: 32 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely. Cloudy, with a high near 46. Northeast wind around 6 mph.

    High: 46 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 48. Southwest wind around 17 mph, with gusts as high as 34 mph.
Thursday
Mostly sunny, with a high near 66. Breezy, with a west southwest wind 16 to 22 mph, with gusts as high as 46 mph.
Thursday Night
Showers likely, mainly after 3am. Cloudy, with a low around 37. West wind 9 to 14 mph becoming light and variable in the evening. Winds could gust as high as 26 mph. Chance of precipitation is 60%.
Friday
Showers and possibly a thunderstorm. High near 50. Calm wind becoming north northeast around 5 mph in the afternoon. Chance of precipitation is 90%.
Friday Night
Showers likely, mainly after midnight. Cloudy, with a low around 34. Northeast wind 3 to 5 mph. Chance of precipitation is 70%.
Saturday
Showers. High near 46. East northeast wind 5 to 7 mph. Chance of precipitation is 80%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 32. East northeast wind around 6 mph. Chance of precipitation is 70%.
Sunday
Showers likely. Cloudy, with a high near 46. Northeast wind around 6 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 32.
Monday
A slight chance of showers before noon. Mostly sunny, with a high near 52.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 34.
Tuesday
A chance of showers. Partly sunny, with a high near 52.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 33.
Wednesday
A chance of showers. Mostly cloudy, with a high near 50.
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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:
12:31 pm MDT Sep 9, 2026
Forecast Valid:
11pm MDT Sep 9, 2026-6pm MDT Sep 16, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation