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

Dangerous Heat in the Southwest; Severe Thunderstorms and Heavy Rain in the Northeast and Mid-Atlantic

Dangerous heat will persist across the Southwest U.S. through Friday with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week. Strong to severe thunderstorms may produce damaging wind, hail, a tornado or two, heavy rain and flash flooding across parts of the Mid-Atlantic and Northeast. Heavy rainfall threat continues across the Gulf Coast. Read More >

Current conditions at

Great Falls, Great Falls International Airport (KGTF)

Lat: 47.47333°NLon: 111.38222°WElev: 3675.0ft.

Clear

86°F

30°C

Humidity 23%
Wind Speed ESE 13 MPH
Barometer 29.97 in (1014.9 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 27 Aug 02:00 PM MDT
Extended Forecast for

Sun Prairie MT

  • This Afternoon

    This Afternoon: A chance of showers, with thunderstorms also possible after 3pm. Some of the storms could be severe. Partly sunny, with a high near 94. South wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    High: 94 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: A 40 percent chance of showers, mainly before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. South wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 18 mph.

    Low: 55 °F

    Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Patchy smoke between 8am and noon. Increasing clouds, with a high near 88. Light and variable wind becoming southwest 11 to 16 mph in the afternoon. Winds could gust as high as 23 mph.

    High: 88 °F

    Patchy Smoke
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: A slight chance of showers between 4am and 5am. Patchy smoke after 5am. Mostly cloudy, with a low around 56. Southwest wind 9 to 14 mph becoming light after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 20%.

    Low: 56 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 3pm. Patchy smoke before 7am. Mostly cloudy, with a high near 79. Light west southwest wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 48. South southeast wind 6 to 9 mph becoming west after midnight. Chance of precipitation is 80%.

    Low: 48 °F

    Showers

  • Sunday

    Sunday: Showers likely, mainly before noon. Partly sunny, with a high near 71. West southwest wind 6 to 11 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A slight chance of showers before midnight. Mostly clear, with a low around 44. Southwest wind 10 to 18 mph, with gusts as high as 26 mph.

    Low: 44 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of showers, with thunderstorms also possible after 3pm. Some of the storms could be severe. Partly sunny, with a high near 94. South wind 10 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Tonight
A 40 percent chance of showers, mainly before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. South wind 5 to 10 mph becoming light southwest after midnight. Winds could gust as high as 18 mph.
Friday
Patchy smoke between 8am and noon. Increasing clouds, with a high near 88. Light and variable wind becoming southwest 11 to 16 mph in the afternoon. Winds could gust as high as 23 mph.
Friday Night
A slight chance of showers between 4am and 5am. Patchy smoke after 5am. Mostly cloudy, with a low around 56. Southwest wind 9 to 14 mph becoming light after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 20%.
Saturday
Showers likely, with thunderstorms also possible after 3pm. Patchy smoke before 7am. Mostly cloudy, with a high near 79. Light west southwest wind increasing to 5 to 9 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
Saturday Night
Showers and possibly a thunderstorm. Low around 48. South southeast wind 6 to 9 mph becoming west after midnight. Chance of precipitation is 80%.
Sunday
Showers likely, mainly before noon. Partly sunny, with a high near 71. West southwest wind 6 to 11 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 60%.
Sunday Night
A slight chance of showers before midnight. Mostly clear, with a low around 44. Southwest wind 10 to 18 mph, with gusts as high as 26 mph.
Monday
Sunny, with a high near 79.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Sunny, with a high near 84.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 49.
Wednesday
A slight chance of showers. Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Sun Prairie MT
 47.54°N 111.5°W (Elev. 3399 ft)
Last Update:
12:31 pm MDT Aug 27, 2026
Forecast Valid:
2pm MDT Aug 27, 2026-6pm MDT Sep 2, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation