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

Watching Hurricane Erin; Heavy Rainfall Threat for Upper Midwest; Heatrisk for Mississippi Valley

Hurricane Erin continues to track westward with its outer bands bringing heavy rainfall and gusty winds for Puerto Rico and US Virgin Islands. Life-threatening surf and rip currents are occurring and will spread across the Atlantic coasts this week. Meanwhile, heavy rainfall and possible flooding are in the forecast for upper Midwest through Monday. Heatrisk continues for the Mississippi Valley. Read More >

Current conditions at

Ravalli County Airport (KHRF)

Lat: 46.25463°NLon: 114.1246°WElev: 3644.0ft.

Overcast

57°F

14°C

Humidity 93%
Wind Speed NNE 4 MPH
Barometer 30.08 in (1018.63 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 17 Aug 07:55 AM MDT
Extended Forecast for

Hamilton MT

  • Today

    Today: A slight chance of rain, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 81. Calm wind becoming south southeast around 6 mph in the afternoon. Chance of precipitation is 60%.

    High: 81 °F

    Slight Chance
    Rain then
    Showers
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms before 9pm, then a chance of rain between 9pm and midnight. Widespread haze between 8pm and 9pm. Partly cloudy, with a low around 53. North wind around 6 mph becoming calm. Chance of precipitation is 30%.

    Low: 53 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: A slight chance of rain between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 89. South southwest wind 5 to 8 mph becoming west northwest in the morning. Winds could gust as high as 18 mph. Chance of precipitation is 20%.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. West wind 5 to 7 mph becoming light and variable after midnight.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. Light and variable wind becoming west around 6 mph in the afternoon.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

Today
A slight chance of rain, then showers likely and possibly a thunderstorm after noon. Partly sunny, with a high near 81. Calm wind becoming south southeast around 6 mph in the afternoon. Chance of precipitation is 60%.
Tonight
A chance of showers and thunderstorms before 9pm, then a chance of rain between 9pm and midnight. Widespread haze between 8pm and 9pm. Partly cloudy, with a low around 53. North wind around 6 mph becoming calm. Chance of precipitation is 30%.
Monday
A slight chance of rain between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 89. South southwest wind 5 to 8 mph becoming west northwest in the morning. Winds could gust as high as 18 mph. Chance of precipitation is 20%.
Monday Night
Mostly clear, with a low around 55. West wind 5 to 7 mph becoming light and variable after midnight.
Tuesday
Sunny, with a high near 94. Light and variable wind becoming west around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Sunny, with a high near 88.
Thursday Night
Mostly clear, with a low around 51.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 52.
Saturday
Sunny, with a high near 93.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hamilton MT
 46.24°N 114.14°W (Elev. 3677 ft)
Last Update:
3:30 am MDT Aug 17, 2025
Forecast Valid:
8am MDT Aug 17, 2025-6pm MDT Aug 23, 2025
 
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