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

Lewistown, Lewistown Municipal Airport (KLWT)

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

Clear

79°F

26°C

Humidity	39%
Wind Speed	E 4 MPH
Barometer	30.01 in (1016.26 mb)
Dewpoint	52°F (11°C)
Visibility	10.00 mi
Heat Index	79°F (26°C)
Last update	17 Aug 02:05 PM MDT

More Information:

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

Extended Forecast for

Lewistown MT

This Afternoon
High: 82 °F
Showers
Likely
Tonight
Low: 54 °F
Showers
Likely then
Haze
Monday
High: 85 °F
Haze then
Chance
Showers
Monday Night
Low: 58 °F
Mostly Clear
Tuesday
High: 92 °F
Sunny
Tuesday Night
Low: 59 °F
Mostly Clear
Wednesday
High: 90 °F
Sunny
Wednesday Night
Low: 56 °F
Partly Cloudy
Thursday
High: 78 °F
Sunny

Detailed Forecast

This Afternoon

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm. Partly sunny, with a high near 82. North wind around 6 mph. Chance of precipitation is 60%.

Tonight

Showers and thunderstorms likely before 10pm, then a slight chance of showers between 10pm and 11pm. Widespread haze after 5am. Cloudy, then gradually becoming partly cloudy, with a low around 54. South southwest wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Monday

A 40 percent chance of showers after noon. Widespread haze before 11am. Mostly sunny, with a high near 85. Calm wind becoming west around 6 mph in the afternoon.

Monday Night

Mostly clear, with a low around 58. Northwest wind around 6 mph becoming southeast after midnight.

Tuesday

Sunny, with a high near 92. Calm wind becoming southwest around 6 mph in the afternoon.

Tuesday Night

Mostly clear, with a low around 59. East wind around 7 mph becoming south 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

Partly cloudy, with a low around 56. North northwest wind 5 to 8 mph becoming southwest after midnight.

Thursday

Sunny, with a high near 78.