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 moderate to locally heavy rain to portions of South Texas into Saturday. Read More >

Current conditions at

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

71°F

22°C

Humidity	56%
Wind Speed	E 10 MPH
Barometer	30.0 in (1015.92 mb)
Dewpoint	55°F (13°C)
Visibility	10.00 mi
Last update	15 Aug 09:54 AM MDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Lewistown MT

Today
High: 84 °F
Sunny
Tonight
Low: 56 °F
Mostly Clear
Saturday
High: 88 °F
Sunny
Saturday Night
Low: 56 °F
Chance
Showers then
Mostly Cloudy
Sunday
High: 84 °F
Mostly Sunny
then Slight
Chance
Showers
Sunday Night
Low: 55 °F
Chance
T-storms then
Mostly Cloudy
Monday
High: 86 °F
Sunny
Monday Night
Low: 57 °F
Mostly Clear
Tuesday
High: 91 °F
Sunny

Detailed Forecast

Today

Sunny, with a high near 84. East southeast wind around 7 mph, with gusts as high as 18 mph.

Tonight

Mostly clear, with a low around 56. East northeast wind 5 to 7 mph becoming calm after midnight.

Saturday

Sunny, with a high near 88. Calm wind becoming north around 6 mph in the afternoon.

Saturday Night

A 30 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 56. East southeast wind around 6 mph becoming light and variable after midnight.

Sunday

A 20 percent chance of showers after noon. Mostly sunny, with a high near 84. Light and variable wind becoming north around 6 mph in the afternoon.

Sunday Night

A 40 percent chance of showers and thunderstorms before midnight. Mostly cloudy, with a low around 55. Southeast wind around 6 mph becoming light and variable after midnight.

Monday

Sunny, with a high near 86. Calm wind becoming west northwest 5 to 7 mph in the afternoon.

Monday Night

Mostly clear, with a low around 57. North northwest wind around 6 mph becoming light and variable after midnight.

Tuesday

Sunny, with a high near 91.

Tuesday Night

Mostly clear, with a low around 60.

Wednesday

Sunny, with a high near 89.

Wednesday Night

Mostly clear, with a low around 57.