National Weather Service United States Department of Commerce

Flash flooding threat continues from the Great Basin across the southern Plains

The wet pattern in place will continue from the Great Basin across the central and southern Rockies into the southern Plains into Wednesday. Ample monsoonal moisture with a frontal boundary in place will allow for shower and thunderstorm development with locally heavy rainfall at times. The heavier showers could lead to flash flooding in some areas, especially urban areas and burn scars.
Read More...

Current Conditions

En Español

Share |

Lewistown MT

7 Day Forecast

For More Weather Information:

Great Falls, MT Local Forecast Office

Today

Sunny

Sunny

High: 32 °C

Tonight

Mostly Clear

Mostly
Clear

Low: 13 °C

Thursday

Sunny

Sunny

High: 32 °C

Thursday
Night

Mostly Clear

Mostly
Clear

Low: 13 °C

Friday

Sunny

Sunny

High: 32 °C

Friday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 13 °C

Saturday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 29 °C

Saturday
Night

Slight Chance Thunderstorms

Slight Chc
Thunderstorms

Low: 12 °C

Sunday

Chance Thunderstorms

Chance
Thunderstorms

High: 29 °C

Detailed Forecast

  • Today Sunny, with a high near 32. Southeast wind 8 to 13 km/h.
  • Tonight Mostly clear, with a low around 13. Southeast wind 11 to 13 km/h.
  • Thursday Sunny, with a high near 32. South wind 6 to 11 km/h becoming light and variable in the afternoon.
  • Thursday Night Mostly clear, with a low around 13. Calm wind becoming south 5 to 10 km/h after midnight.
  • Friday Sunny, with a high near 32. Calm wind.
  • Friday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 13.
  • Saturday A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 29.
  • Saturday Night A slight chance of showers and thunderstorms. Partly cloudy, with a low around 12.
  • Sunday A chance of showers and thunderstorms. Mostly sunny, with a high near 29.
  • Sunday Night A chance of showers and thunderstorms. Partly cloudy, with a low around 12.
  • Monday A chance of showers and thunderstorms. Mostly sunny, with a high near 27.
  • Monday Night A chance of showers and thunderstorms. Partly cloudy, with a low around 12.
  • Tuesday A chance of showers and thunderstorms. Mostly sunny, with a high near 28.