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

Areas of Dangerous Heat and Severe Thunderstorms

Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week before returning over much of the Plains into next week. Severe thunderstorms are expected across parts of the central and southern High Plains, central Great Lakes, and Ozarks Wednesday. Read More >

Current conditions at

USCRN SITE NEAR ST. MARY 1SSW (MRYM8)

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

NA

76°F

24°C

Humidity 30%
Wind Speed NA 5 MPH
Barometer NA
Dewpoint 42°F (6°C)
Visibility NA
Heat Index77°F (25°C)
Last update 25 Aug 07:10 PM MDT
Extended Forecast for

St Mary MT

  • Tonight

    Tonight: Patchy smoke after 4am. Partly cloudy, with a low around 50. Southeast wind around 5 mph becoming calm in the evening.

    Low: 50 °F

    Mostly Clear
    then Patchy
    Smoke

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 2pm. Patchy smoke before 2pm. Sunny, with a high near 86. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 86 °F

    Patchy Smoke
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 9pm. Patchy smoke after midnight. Mostly cloudy, with a low around 53. Light and variable wind becoming southwest around 5 mph after midnight.

    Low: 53 °F

    Slight Chance
    T-storms then
    Patchy Smoke

  • Thursday

    Thursday: A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 84. South southwest wind 5 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    High: 84 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly clear, with a low around 50. Southwest wind 7 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

    Low: 50 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 72. Southwest wind 6 to 13 mph, with gusts as high as 25 mph.

    High: 72 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 44. Southwest wind 5 to 10 mph, with gusts as high as 24 mph.

    Low: 44 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of showers after noon. Sunny, with a high near 69. Light west southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 22 mph.

    High: 69 °F

    Sunny then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers. Partly cloudy, with a low around 40.

    Low: 40 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Patchy smoke after 4am. Partly cloudy, with a low around 50. Southeast wind around 5 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers and thunderstorms after 2pm. Patchy smoke before 2pm. Sunny, with a high near 86. Calm wind becoming south southeast around 6 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 9pm. Patchy smoke after midnight. Mostly cloudy, with a low around 53. Light and variable wind becoming southwest around 5 mph after midnight.
Thursday
A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 84. South southwest wind 5 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight. Mostly clear, with a low around 50. Southwest wind 7 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Friday
Sunny, with a high near 72. Southwest wind 6 to 13 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 44. Southwest wind 5 to 10 mph, with gusts as high as 24 mph.
Saturday
A slight chance of showers after noon. Sunny, with a high near 69. Light west southwest wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 22 mph.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 40.
Sunday
A slight chance of showers. Mostly sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 40.
Monday
Sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St Mary MT
 48.74°N 113.44°W (Elev. 4554 ft)
Last Update:
8:02 pm MDT Aug 25, 2026
Forecast Valid:
8pm MDT Aug 25, 2026-6pm MDT Sep 1, 2026
 
Forecast Discussion
 
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Additional Resources

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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