National Weather Service United States Department of Commerce

Heavy rain possible for parts of the northern Rockies & Plains; Severe storms for the Upper Midwest

An unseasonably strong storm system in the northwest U.S. will bring showers and thunderstorms, some heavy, to parts of the northern Rockies and northern Plains through Saturday. Isolated flash floods will be possible in these areas. Some of the storms could be severe in parts of the Dakotas into Minnesota, with large hail and damaging winds.
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Hazardous Weather Conditions

Current Conditions

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Yellowstone National Park WY

7 Day Forecast

For More Weather Information:

Riverton, WY Local Forecast Office

Overnight

Chance Rain/Snow Chance for Measurable Precipitation 50%

Chance
Rain/Snow

Low: 36 °F

Saturday

Chance Rain/Snow Chance for Measurable Precipitation 50%

Chance
Rain/Snow

High: 50 °F

Saturday
Night

Chance Rain/Snow Chance for Measurable Precipitation 50%

Chance
Rain/Snow

Low: 31 °F

Sunday

Scattered Showers Chance for Measurable Precipitation 40%

Scattered
Showers

High: 50 °F

Sunday
Night

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

Low: 32 °F

Monday

Scattered Showers Chance for Measurable Precipitation 40%

Scattered
Showers

High: 55 °F

Monday
Night

Scattered Showers Chance for Measurable Precipitation 50%

Scattered
Showers

Low: 33 °F

Tuesday

Slight Chance Thunderstorms Chance for Measurable Precipitation 20%

Slight Chc
Thunderstorms

High: 58 °F

Tuesday
Night

Partly Cloudy

Partly
Cloudy

Low: 34 °F

Detailed Forecast

  • Overnight Scattered rain showers before 3am, then scattered rain and snow showers between 3am and 5am, then scattered snow showers after 5am. Some thunder is also possible. Mostly cloudy, with a low around 36. South southwest wind around 10 mph. Chance of precipitation is 50%. Total nighttime snow accumulation of less than a half inch possible.
  • Saturday Scattered snow showers before 9am, then scattered rain showers. Some thunder is also possible. Mostly cloudy, with a high near 50. Southwest wind 8 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.
  • Saturday Night Scattered rain showers before midnight, then scattered rain and snow showers. Some thunder is also possible. Mostly cloudy, with a low around 31. West wind 8 to 10 mph. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
  • Sunday Scattered showers and thunderstorms. Mostly cloudy, with a high near 50. West wind 6 to 9 mph becoming east in the morning. Chance of precipitation is 40%.
  • Sunday Night A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 32. West wind 5 to 7 mph becoming light and variable.
  • Monday Scattered showers and thunderstorms, mainly after noon. Mostly cloudy, with a high near 55. South southwest wind 6 to 9 mph. Chance of precipitation is 40%.
  • Monday Night Scattered showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 33. Southwest wind around 6 mph becoming calm after midnight. Chance of precipitation is 50%.
  • Tuesday A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 58.
  • Tuesday Night Partly cloudy, with a low around 34.
  • Wednesday Sunny, with a high near 63.
  • Wednesday Night Mostly clear, with a low around 37.
  • Thursday Mostly sunny, with a high near 64.
  • Thursday Night Partly cloudy, with a low around 38.
  • Friday A slight chance of showers and thunderstorms. Mostly sunny, with a high near 62.