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

Lewistown, Lewistown Municipal Airport (KLWT)

Lat: 47.04917°NLon: 109.46639°WElev: 4167.0ft.

thunder,heavy rain

66°F

19°C

Humidity 63%
Wind Speed W 13 MPH
Barometer 30.01 in (1016.26 mb)
Dewpoint 54°F (12°C)
Visibility 3.00 mi
Last update 16 Aug 08:52 PM MDT
Extended Forecast for

7 Miles NW Lewistown Municipal MT

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. West wind around 6 mph becoming calm after midnight.

    Low: 55 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers after 4pm. Widespread haze between 2pm and 4pm. Mostly sunny, with a high near 83. Calm wind becoming north northwest around 6 mph in the afternoon.

    High: 83 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms before midnight. Widespread haze between 10pm and 2am. Cloudy, then gradually becoming partly cloudy, with a low around 55. East wind 5 to 7 mph becoming light and variable after midnight.

    Low: 55 °F

    Chance
    T-storms then
    Haze

  • Monday

    Monday: A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. Calm wind becoming west northwest around 6 mph in the afternoon. Chance of precipitation is 20%.

    High: 87 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday 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 58. North wind around 6 mph becoming south southeast after midnight. Chance of precipitation is 20%.

    Low: 58 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Calm wind becoming east around 6 mph in the afternoon.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59. Northeast wind around 7 mph becoming south southeast after midnight.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90. South wind 5 to 9 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57.

    Low: 57 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 55. West wind around 6 mph becoming calm after midnight.
Sunday
A 30 percent chance of showers after 4pm. Widespread haze between 2pm and 4pm. Mostly sunny, with a high near 83. Calm wind becoming north northwest around 6 mph in the afternoon.
Sunday Night
A 40 percent chance of showers and thunderstorms before midnight. Widespread haze between 10pm and 2am. Cloudy, then gradually becoming partly cloudy, with a low around 55. East wind 5 to 7 mph becoming light and variable after midnight.
Monday
A slight chance of showers between noon and 3pm, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 87. Calm wind becoming west northwest around 6 mph in the afternoon. Chance of precipitation is 20%.
Monday 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 58. North wind around 6 mph becoming south southeast after midnight. Chance of precipitation is 20%.
Tuesday
Sunny, with a high near 93. Calm wind becoming east around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 59. Northeast wind around 7 mph becoming south southeast after midnight.
Wednesday
Sunny, with a high near 90. South wind 5 to 9 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Wednesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57.
Thursday
A slight chance of showers after noon. Sunny, with a high near 80.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 51.
Friday
Sunny, with a high near 74.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
7 Miles NW Lewistown Municipal MT
 47.12°N 109.56°W (Elev. 3707 ft)
Last Update:
4:44 pm MDT Aug 16, 2025
Forecast Valid:
9pm MDT Aug 16, 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