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

Severe Weather and Heavy Rain from the Great Lakes to the Mid-Atlantic; Heat Persists in the East

Widespread strong thunderstorms with damaging winds and locally heavy rain are expected from the Upper Ohio Valley into the southern Mid-Atlantic today and portions of the central Appalachians and Carolinas on Saturday. Monsoonal moisture will bring a flash flooding threat to the Desert Southwest. Sweltering heat persists from the Plains to the southern Mid-Atlantic through tonight. Read More >

Current conditions at

ST. MARY (SRYM8)

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

NA

47°F

8°C

Humidity 95%
Wind Speed NE 5 MPH
Barometer NA
Dewpoint 46°F (8°C)
Visibility NA
Wind Chill45°F (7°C)
Last update 05 Sep 06:11 AM MDT
Extended Forecast for

St Mary MT

  • Today

    Today: Showers likely before 11am, then a chance of showers after noon. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 59. Calm wind becoming east northeast around 6 mph in the afternoon. Chance of precipitation is 60%.

    High: 59 °F

    Showers
    Likely and
    Areas Fog

  • Tonight

    Tonight: Showers and possibly a thunderstorm. Areas of fog after 11pm. Low around 39. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Showers and
    Areas Fog

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 3pm. Areas of fog before 11am. High near 59. Calm wind becoming east northeast around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 59 °F

    Showers and
    Areas Fog
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 9pm, then showers between 9pm and midnight, then rain after midnight. Low around 40. Light and variable wind. Chance of precipitation is 90%.

    Low: 40 °F

    Showers

  • Labor Day

    Labor Day: Rain before noon, then showers and possibly a thunderstorm after noon. High near 56. Calm wind becoming north northwest around 6 mph in the afternoon. Chance of precipitation is 100%.

    High: 56 °F

    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before midnight, then rain after midnight. Low around 37. West southwest wind 7 to 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.

    Low: 37 °F

    Showers

  • Tuesday

    Tuesday: A 50 percent chance of rain, mainly before noon. Mostly cloudy, with a high near 61. West southwest wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 61 °F

    Chance Rain
    then Slight
    Chance Rain

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 37. West southwest wind 6 to 8 mph.

    Low: 37 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

Today
Showers likely before 11am, then a chance of showers after noon. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 59. Calm wind becoming east northeast around 6 mph in the afternoon. Chance of precipitation is 60%.
Tonight
Showers and possibly a thunderstorm. Areas of fog after 11pm. Low around 39. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers, with thunderstorms also possible after 3pm. Areas of fog before 11am. High near 59. Calm wind becoming east northeast around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Showers and possibly a thunderstorm before 9pm, then showers between 9pm and midnight, then rain after midnight. Low around 40. Light and variable wind. Chance of precipitation is 90%.
Labor Day
Rain before noon, then showers and possibly a thunderstorm after noon. High near 56. Calm wind becoming north northwest around 6 mph in the afternoon. Chance of precipitation is 100%.
Monday Night
Showers and possibly a thunderstorm before midnight, then rain after midnight. Low around 37. West southwest wind 7 to 9 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.
Tuesday
A 50 percent chance of rain, mainly before noon. Mostly cloudy, with a high near 61. West southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 37. West southwest wind 6 to 8 mph.
Wednesday
Sunny, with a high near 66.
Wednesday Night
Mostly clear, with a low around 43.
Thursday
Mostly sunny, with a high near 68.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 41.
Friday
A chance of showers. Partly sunny, with a high near 63.
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ABOUT THIS FORECAST

 
Point Forecast:
St Mary MT
 48.74°N 113.44°W (Elev. 4554 ft)
Last Update:
5:26 am MDT Sep 5, 2026
Forecast Valid:
7am MDT Sep 5, 2026-6pm MDT Sep 11, 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