Lewistown, Montana | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
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10 Day Forecast
  • Forecast night icon
    Night
    Partly Cloudy
    47°
    Saturday 5/11
    Forecast night icon
    47°
    Partly Cloudy
    Hourly
    Night Details
    Partly cloudy. A 20 percent chance of rain showers after midnight. Lows 45 to 50. West winds 5 to 10 mph.
  • Forecast day icon
    Sunday
    Mostly Cloudy
    72°
    Forecast night icon
    Night
    Partly Cloudy
    50°
    Sunday 5/12
    Day
    72°
    Mostly Cloudy
    Forecast day icon
    Night
    50°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy in the morning then sunny with a 20 percent chance of thunderstorms in the afternoon. Highs 70 to 75. Northwest winds 5 to 15 mph.
    Night Details
    Partly cloudy. Slight chance of thunderstorms in the evening then slight chance of rain showers after midnight. Lows around 50. South winds 5 to 15 mph. Chance of precipitation 20 percent.
  • Forecast day icon
    Monday
    40% Chance of Storms
    72°
    Forecast night icon
    Night
    40% Chance of Storms
    50°
    Monday 5/13
    Day
    72°
    40% Chance of Storms
    Forecast day icon
    Night
    50°
    40% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Sunny in the morning then partly cloudy with chance of rain showers and slight chance of thunderstorms in the afternoon. Highs around 75. West winds 10 to 20 mph. Chance of precipitation 40 percent.
    Night Details
    Mostly cloudy. Chance of rain showers and slight chance of thunderstorms in the evening then slight chance of thunderstorms after midnight. Lows 45 to 50. West winds 10 to 15 mph. Chance of precipitation 40 percent.
  • Forecast day icon
    Tuesday
    70% Chance of Storms
    59°
    Forecast night icon
    Night
    Partly Cloudy
    43°
    Tuesday 5/14
    Day
    59°
    70% Chance of Storms
    Forecast day icon
    Night
    43°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Breezy cooler. Rain showers likely and chance of thunderstorms. Highs 60 to 65. Chance of precipitation 70 percent.
    Night Details
    Partly cloudy with a 20 percent chance of rain. Lows 40 to 45.
  • Forecast day icon
    Wednesday
    30% Chance of Storms
    66°
    Forecast night icon
    Night
    Partly Cloudy
    47°
    Wednesday 5/15
    Day
    66°
    30% Chance of Storms
    Forecast day icon
    Night
    47°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly cloudy with chance of rain showers and slight chance of thunderstorms. Highs 65 to 70. Chance of precipitation 30 percent.
    Night Details
    Partly cloudy with a 20 percent chance of rain. Lows 45 to 50.
  • Forecast day icon
    Thursday
    50% Chance of Rain
    69°
    Forecast night icon
    Night
    40% Chance of Rain
    45°
    Thursday 5/16
    Day
    69°
    50% Chance of Rain
    Forecast day icon
    Night
    45°
    40% Chance of Rain
    Forecast night icon
    Hourly
    Day Details
    Breezy. Mostly cloudy with a 50 percent chance of rain. Highs around 70.
    Night Details
    Partly cloudy with a 40 percent chance of rain. Lows around 45.
  • Forecast day icon
    Friday
    Partly Cloudy
    62°
    Forecast night icon
    Night
    Mostly Cloudy
    42°
    Friday 5/17
    Day
    62°
    Partly Cloudy
    Forecast day icon
    Night
    42°
    Mostly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly cloudy with a 20 percent chance of thunderstorms. Highs 60 to 65.
    Night Details
    Mostly cloudy with a 20 percent chance of rain. Lows 40 to 45.
  • Forecast day icon
    Saturday
    40% Chance of Storms
    65°
    Forecast night icon
    Night
    Clear
    44°
    Saturday 5/18
    Day
    65°
    40% Chance of Storms
    Forecast day icon
    Night
    44°
    Clear
    Forecast night icon
    Day Details
    Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs around 60. Chance of precipitation 40 percent.
    Night Details
    Clear. Low temperature around 44F. Dew point will be around 38F with an average humidity of 64%. Winds will be 4 mph from the S.
  • Forecast day icon
    Sunday
    30% Chance of Rain
    67°
    Forecast night icon
    Night
    40% Chance of Rain
    44°
    Sunday 5/19
    Day
    67°
    30% Chance of Rain
    Forecast day icon
    Night
    44°
    40% Chance of Rain
    Forecast night icon
    Day Details
    Sunny with a slight chance of rain. Chance of precipitation 25%. High temperature around 67F. Dew point will be around 41F with an average humidity of 50%. Winds will be 5 mph from the W.
    Night Details
    Partly cloudy with a chance of rain. Chance of precipitation 40%. Low temperature around 44F. Dew point will be around 40F with an average humidity of 66%. Winds will be 4 mph from the SW.
  • Forecast day icon
    Monday
    50% Chance of Rain
    62°
    Forecast night icon
    Night
    40% Chance of Rain
    41°
    Monday 5/20
    Day
    62°
    50% Chance of Rain
    Forecast day icon
    Night
    41°
    40% Chance of Rain
    Forecast night icon
    Day Details
    Partly cloudy with a chance of rain. Chance of precipitation 45%. High temperature around 62F. Dew point will be around 42F with an average humidity of 59%. Winds will be 7 mph from the W.
    Night Details
    Mostly cloudy with a chance of rain. Chance of precipitation 40%. Low temperature around 41F. Dew point will be around 39F with an average humidity of 70%. Winds will be 5 mph from the W.