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

Dangerous Heat Builds and Expands; Critical Fire Weather for the Southwest; Severe Thunderstorms for Plains and Midwest

Dangerous to record breaking heat will build across the center of the nation and slowly build eastward this week. Wildfire conditions remain critical for the Southwest and portions of the Great Basin through Monday. For the northern Plains and upper Midwest, severe thunderstorms with the potential for large to very large hail and severe winds are the primary hazards. Read More >

Current conditions at

Bearmouth I-90 MP 145.8 (MTBRM)

Lat: 46.71854°NLon: 113.29534°WElev: 3901.0ft.

unknown precip

46°F

8°C

Humidity 99%
Wind Speed SW 0 MPH
Barometer NA
Dewpoint 46°F (8°C)
Visibility NA
Last update 29 Jun 12:00 AM MDT
Extended Forecast for

Potomac MT

  • Overnight

    Overnight: Rain. Low around 40. West southwest wind around 14 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 40 °F

    Rain

  • Monday

    Monday: Rain, mainly before 5pm. High near 52. West southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 52 °F

    Rain

  • Monday Night

    Monday Night: Rain, mainly before 10pm. Patchy fog after 4am. Low around 44. West wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 44 °F

    Rain then
    Chance Rain
    and Patchy
    Fog

  • Tuesday

    Tuesday: A chance of rain and thunderstorms before 3pm, then a chance of showers and thunderstorms, mainly after 5pm. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 73. Light and variable wind. Chance of precipitation is 40%.

    High: 73 °F

    Chance
    Showers and
    Areas Fog

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 46. Calm wind. Chance of precipitation is 50%.

    Low: 46 °F

    Chance
    Showers then
    Slight Chance
    Rain and
    Patchy Fog

  • Wednesday

    Wednesday: A chance of rain before noon, then a chance of showers and thunderstorms after noon. Areas of fog before 8am. Otherwise, partly sunny, with a high near 73. Chance of precipitation is 40%.

    High: 73 °F

    Chance Rain
    and Areas Fog
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms before 9pm, then a slight chance of rain between 9pm and midnight. Partly cloudy, with a low around 43. Chance of precipitation is 20%.

    Low: 43 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Overnight
Rain. Low around 40. West southwest wind around 14 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Rain, mainly before 5pm. High near 52. West southwest wind 7 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Monday Night
Rain, mainly before 10pm. Patchy fog after 4am. Low around 44. West wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Tuesday
A chance of rain and thunderstorms before 3pm, then a chance of showers and thunderstorms, mainly after 5pm. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 73. Light and variable wind. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 46. Calm wind. Chance of precipitation is 50%.
Wednesday
A chance of rain before noon, then a chance of showers and thunderstorms after noon. Areas of fog before 8am. Otherwise, partly sunny, with a high near 73. Chance of precipitation is 40%.
Wednesday Night
A slight chance of showers and thunderstorms before 9pm, then a slight chance of rain between 9pm and midnight. Partly cloudy, with a low around 43. Chance of precipitation is 20%.
Thursday
Mostly sunny, with a high near 76.
Thursday Night
Partly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 76.
Friday Night
Partly cloudy, with a low around 44.
Independence Day
Sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 46.
Sunday
Sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Potomac MT
 46.89°N 113.59°W (Elev. 3589 ft)
Last Update:
2:01 am MDT Jun 29, 2026
Forecast Valid:
4am MDT Jun 29, 2026-6pm MDT Jul 5, 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