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

Erin Strengthens to a Hurricane; Heavy Rainfall Possible in Puerto Rico and the Virgin Islands, the Upper Midwest, South Texas

Hurricane Erin may bring isolated flash and urban flooding, landslides or mudslides, and possible tropical storm conditions to Puerto Rico and the U.S. Virgin Islands this weekend. Scattered thunderstorms and heavy rainfall may bring areas of flooding this weekend over the Upper Midwest. A tropical disturbance will bring locally heavy rain and mainly urban flash flooding to far southern Texas. Read More >

Current conditions at

Big Timber Airport (K6S0)

Lat: 45.80647°NLon: 109.97826°WElev: 4494.0ft.

Partly Cloudy

59°F

15°C

Humidity 58%
Wind Speed W 8 MPH
Barometer 30.03 in (1016.93 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 17 Aug 03:35 AM MDT
Extended Forecast for

4 Miles ENE Harlowton MT

  • Today

    Today: A 50 percent chance of showers and thunderstorms, mainly after 4pm. Increasing clouds, with a high near 83. West northwest wind 5 to 9 mph becoming east southeast in the afternoon.

    High: 83 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 9pm, then a slight chance of showers between 9pm and 10pm. Cloudy, then gradually becoming partly cloudy, with a low around 50. West wind 6 to 10 mph becoming north northeast in the evening. Chance of precipitation is 60%.

    Low: 50 °F

    Showers
    Likely then
    Partly Cloudy

  • Monday

    Monday: Areas of smoke between 9am and noon. Sunny, with a high near 86. Light and variable wind becoming south southwest 5 to 9 mph in the afternoon.

    High: 86 °F

    Areas Smoke
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. Southwest wind 6 to 9 mph becoming north northeast after midnight.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 93. West wind around 7 mph becoming south in the afternoon.

    High: 93 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 56. East southeast wind 6 to 9 mph becoming north northwest after midnight.

    Low: 56 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 93. West wind 8 to 14 mph.

    High: 93 °F

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. Northwest wind 10 to 13 mph.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 81. North wind around 10 mph.

    High: 81 °F

    Sunny

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms, mainly after 4pm. Increasing clouds, with a high near 83. West northwest wind 5 to 9 mph becoming east southeast in the afternoon.
Tonight
Showers and thunderstorms likely before 9pm, then a slight chance of showers between 9pm and 10pm. Cloudy, then gradually becoming partly cloudy, with a low around 50. West wind 6 to 10 mph becoming north northeast in the evening. Chance of precipitation is 60%.
Monday
Areas of smoke between 9am and noon. Sunny, with a high near 86. Light and variable wind becoming south southwest 5 to 9 mph in the afternoon.
Monday Night
Mostly clear, with a low around 55. Southwest wind 6 to 9 mph becoming north northeast after midnight.
Tuesday
Sunny and hot, with a high near 93. West wind around 7 mph becoming south in the afternoon.
Tuesday Night
Mostly clear, with a low around 56. East southeast wind 6 to 9 mph becoming north northwest after midnight.
Wednesday
Sunny and hot, with a high near 93. West wind 8 to 14 mph.
Wednesday Night
Partly cloudy, with a low around 56. Northwest wind 10 to 13 mph.
Thursday
Sunny, with a high near 81. North wind around 10 mph.
Thursday Night
Mostly clear, with a low around 50. North northeast wind 8 to 13 mph becoming east after midnight.
Friday
Sunny, with a high near 77. North northeast wind 7 to 11 mph becoming east southeast in the afternoon.
Friday Night
Mostly clear, with a low around 48. East wind 6 to 14 mph.
Saturday
Sunny, with a high near 79. East southeast wind 6 to 10 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ENE Harlowton MT
 46.47°N 109.77°W (Elev. 4400 ft)
Last Update:
12:47 am MDT Aug 17, 2025
Forecast Valid:
4am 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