Lewistown, Montana | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
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10 Day Forecast
  • Forecast night icon
    Night
    50% Chance Rain Showers
    36°
    Friday 5/17
    Forecast night icon
    36°
    50% Chance Rain Showers
    Hourly
    Night Details
    Windy colder. Mostly cloudy with chance of rain showers in the evening then partly cloudy with slight chance of rain showers after midnight. Lows 35 to 40. West winds 25 to 35 mph decreasing to 15 to 25 mph after midnight. Chance of showers 50 percent.
  • Forecast day icon
    Saturday
    Windy
    61°
    Forecast night icon
    Night
    Partly Cloudy
    40°
    Saturday 5/18
    Day
    61°
    Windy
    Forecast day icon
    Night
    40°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Windy sunny. Highs 60 to 65. West winds 20 to 30 mph.
    Night Details
    Partly cloudy in the evening then becoming mostly cloudy. Lows 40 to 45. West winds up to 10 mph.
  • Forecast day icon
    Sunday
    50% Chance of Storms
    55°
    Forecast night icon
    Night
    50% Chance Rain Showers
    34°
    Sunday 5/19
    Day
    55°
    50% Chance of Storms
    Forecast day icon
    Night
    34°
    50% Chance Rain Showers
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy. Slight chance of rain showers in the morning then chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 55 to 60. Northwest winds 5 to 15 mph. Chance of precipitation 50 percent.
    Night Details
    Mostly cloudy. Chance of rain showers in the evening then slight chance of rain showers after midnight. Lows 35 to 40. Northwest winds 5 to 15 mph. Chance of showers 50 percent.
  • Forecast day icon
    Monday
    50% Chance of Storms
    56°
    Forecast night icon
    Night
    Mostly Cloudy
    33°
    Monday 5/20
    Day
    56°
    50% Chance of Storms
    Forecast day icon
    Night
    33°
    Mostly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs around 55. Chance of precipitation 50 percent.
    Night Details
    Mostly cloudy. Lows 35 to 40.
  • Forecast day icon
    Tuesday
    Partly Cloudy
    60°
    Forecast night icon
    Night
    Partly Cloudy
    37°
    Tuesday 5/21
    Day
    60°
    Partly Cloudy
    Forecast day icon
    Night
    37°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly cloudy with a 20 percent chance of thunderstorms. Highs 60 to 65.
    Night Details
    Partly cloudy. Lows around 40.
  • Forecast day icon
    Wednesday
    50% Chance of Storms
    64°
    Forecast night icon
    Night
    50% Chance Rain Showers
    41°
    Wednesday 5/22
    Day
    64°
    50% Chance of Storms
    Forecast day icon
    Night
    41°
    50% Chance Rain Showers
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs 60 to 65. Chance of precipitation 50 percent.
    Night Details
    Mostly cloudy with a 50 percent chance of rain showers. Lows 40 to 45.
  • Forecast day icon
    Thursday
    70% Chance Rain Showers
    63°
    Forecast night icon
    Night
    50% Chance Rain Showers
    39°
    Thursday 5/23
    Day
    63°
    70% Chance Rain Showers
    Forecast day icon
    Night
    39°
    50% Chance Rain Showers
    Forecast night icon
    Hourly
    Day Details
    Rain showers likely. Highs 50 to 60. Chance of showers 70 percent.
    Night Details
    Mostly cloudy with a 50 percent chance of rain showers. Lows around 40.
  • Forecast day icon
    Friday
    50% Chance of Storms
    56°
    Forecast night icon
    Night
    40% Chance of Rain
    39°
    Friday 5/24
    Day
    56°
    50% Chance of Storms
    Forecast day icon
    Night
    39°
    40% Chance of Rain
    Forecast night icon
    Day Details
    Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs 55 to 60. Chance of precipitation 50 percent.
    Night Details
    Mostly cloudy with a chance of rain. Chance of precipitation 40%. Low temperature around 39F. Dew point will be around 37F with an average humidity of 75%. Winds will be 5 mph from the SW.
  • Forecast day icon
    Saturday
    60% Chance of Rain
    62°
    Forecast night icon
    Night
    50% Chance of Rain
    40°
    Saturday 5/25
    Day
    62°
    60% Chance of Rain
    Forecast day icon
    Night
    40°
    50% Chance of Rain
    Forecast night icon
    Day Details
    Cloudy with a chance of rain. Chance of precipitation 60%. High temperature around 62F. Dew point will be around 40F with an average humidity of 59%. Winds will be 6 mph from the NW.
    Night Details
    Partly cloudy with a chance of rain. Chance of precipitation 45%. Low temperature around 40F. Dew point will be around 38F with an average humidity of 69%. Winds will be 5 mph from the SW.
  • Forecast day icon
    Sunday
    50% Chance of Rain
    65°
    Forecast night icon
    Night
    30% Chance of Rain
    43°
    Sunday 5/26
    Day
    65°
    50% Chance of Rain
    Forecast day icon
    Night
    43°
    30% Chance of Rain
    Forecast night icon
    Day Details
    Partly cloudy with a chance of rain. Chance of precipitation 50%. High temperature around 65F. Dew point will be around 41F with an average humidity of 55%. Winds will be 4 mph from the NW.
    Night Details
    Mostly cloudy with a slight chance of rain. Chance of precipitation 30%. Low temperature around 43F. Dew point will be around 39F with an average humidity of 67%. Winds will be 4 mph from the SW.