National Weather Service United States Department of Commerce

Heavy rain forecast for parts of the Southwest

The combination of a slow-moving front and monsoon moisture will bring thunderstorms to parts of the Southwest, some with heavy rain that could lead to isolated flash flooding. Areas at risk include southern Arizona, New Mexico and western Texas.
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Current Conditions

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Lewistown MT

7 Day Forecast

For More Weather Information:

Great Falls, MT Local Forecast Office

Overnight

Mostly Clear

Mostly
Clear

Low: 55 °F

Friday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 89 °F

Friday
Night

Mostly Clear

Mostly
Clear

Low: 55 °F

Saturday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 88 °F

Saturday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 57 °F

Sunday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 85 °F

Sunday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 56 °F

Monday

Chance Thunderstorms

Chance
Thunderstorms

High: 82 °F

Monday
Night

Chance Thunderstorms

Chance
Thunderstorms

Low: 55 °F

Detailed Forecast

  • Overnight Mostly clear, with a low around 55. South wind 3 to 5 mph.
  • Friday A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 89. Southwest wind around 5 mph becoming calm.
  • Friday Night Mostly clear, with a low around 55. East northeast wind 6 to 8 mph becoming south southeast after midnight.
  • Saturday A 20 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 88. Southeast wind around 7 mph.
  • Saturday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 57. Northeast wind around 6 mph becoming west southwest after midnight.
  • Sunday A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
  • Sunday Night A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
  • Monday A chance of showers and thunderstorms. Mostly sunny, with a high near 82.
  • Monday Night A chance of showers and thunderstorms. Partly cloudy, with a low around 55.
  • Tuesday A chance of showers and thunderstorms. Mostly sunny, with a high near 82.
  • Tuesday Night A chance of showers and thunderstorms. Partly cloudy, with a low around 53.
  • Wednesday Mostly sunny, with a high near 85.
  • Wednesday Night Partly cloudy, with a low around 55.
  • Thursday Sunny, with a high near 87.