Lewistown, Montana | 10-Day Weather Forecasts & Weekend Weather | WeatherBug
Main Menu
10 Day Forecast
  • Forecast night icon
    Night
    Mostly Clear
    33°
    Sunday 5/19
    Forecast night icon
    33°
    Mostly Clear
    Hourly
    Night Details
    Colder. Mostly clear. Lows 30 to 40. West winds 5 to 15 mph.
  • Forecast day icon
    Monday
    50% Chance of Storms
    55°
    Forecast night icon
    Night
    Partly Cloudy
    36°
    Monday 5/20
    Day
    55°
    50% Chance of Storms
    Forecast day icon
    Night
    36°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly cloudy with slight chance of rain in the morning then mostly cloudy with chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 55 to 60. Northwest winds 5 to 10 mph. Chance of precipitation 50 percent.
    Night Details
    Partly cloudy. Lows 35 to 40. West winds up to 10 mph.
  • Forecast day icon
    Tuesday
    50% Chance of Storms
    57°
    Forecast night icon
    Night
    Partly Cloudy
    40°
    Tuesday 5/21
    Day
    57°
    50% Chance of Storms
    Forecast day icon
    Night
    40°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Partly cloudy in the morning then mostly cloudy with chance of rain showers and slight chance of thunderstorms in the afternoon. Highs 60 to 65. West winds up to 10 mph. Chance of precipitation 50 percent.
    Night Details
    Partly cloudy. Lows around 40. Southwest winds up to 10 mph.
  • Forecast day icon
    Wednesday
    50% Chance of Storms
    63°
    Forecast night icon
    Night
    80% Chance of Storms
    43°
    Wednesday 5/22
    Day
    63°
    50% Chance of Storms
    Forecast day icon
    Night
    43°
    80% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy with a 50 percent chance of thunderstorms. Highs 60 to 65.
    Night Details
    Rain showers and slight chance of thunderstorms. Lows 40 to 45. Chance of precipitation 80 percent.
  • Forecast day icon
    Thursday
    Thunderstorms
    52°
    Forecast night icon
    Night
    50% Chance of Rain
    37°
    Thursday 5/23
    Day
    52°
    Thunderstorms
    Forecast day icon
    Night
    37°
    50% Chance of Rain
    Forecast night icon
    Hourly
    Day Details
    Rain showers and slight chance of thunderstorms. Highs 50 to 55. Chance of precipitation 90 percent.
    Night Details
    Mostly cloudy with a 50 percent chance of rain. Lows 35 to 40.
  • Forecast day icon
    Friday
    50% Chance of Storms
    59°
    Forecast night icon
    Night
    Partly Cloudy
    37°
    Friday 5/24
    Day
    59°
    50% Chance of Storms
    Forecast day icon
    Night
    37°
    Partly Cloudy
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs around 60. Chance of precipitation 50 percent.
    Night Details
    Partly cloudy with a 20 percent chance of rain. Lows 40 to 45.
  • Forecast day icon
    Saturday
    50% Chance of Storms
    66°
    Forecast night icon
    Night
    50% Chance of Storms
    41°
    Saturday 5/25
    Day
    66°
    50% Chance of Storms
    Forecast day icon
    Night
    41°
    50% Chance of Storms
    Forecast night icon
    Hourly
    Day Details
    Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs 65 to 70. Lows 40 to 45. Chance of precipitation 50 percent.
    Night Details
    Mostly cloudy with chance of rain showers and slight chance of thunderstorms. Highs 65 to 70. Lows 40 to 45. Chance of precipitation 50 percent.
  • Forecast day icon
    Sunday
    50% Chance of Storms
    58°
    Forecast night icon
    Night
    40% Chance of Rain
    40°
    Sunday 5/26
    Day
    58°
    50% Chance of Storms
    Forecast day icon
    Night
    40°
    40% Chance of Rain
    Forecast night icon
    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
    Partly cloudy with a chance of rain. Chance of precipitation 35%. Low temperature around 40F. Dew point will be around 38F with an average humidity of 74%. Winds will be 9 mph from the W.
  • Forecast day icon
    Monday
    30% Chance of Rain
    62°
    Forecast night icon
    Night
    Mostly Clear
    43°
    Monday 5/27
    Day
    62°
    30% Chance of Rain
    Forecast day icon
    Night
    43°
    Mostly Clear
    Forecast night icon
    Day Details
    Mostly cloudy with a slight chance of rain. Chance of precipitation 30%. High temperature around 62F. Dew point will be around 40F with an average humidity of 58%. Winds will be 11 mph from the W.
    Night Details
    Mostly clear. Low temperature around 43F. Dew point will be around 39F with an average humidity of 68%. Winds will be 8 mph from the SW.
  • Forecast day icon
    Tuesday
    Sunny
    70°
    Forecast night icon
    Night
    Clear
    46°
    Tuesday 5/28
    Day
    70°
    Sunny
    Forecast day icon
    Night
    46°
    Clear
    Forecast night icon
    Day Details
    Sunny. High temperature around 70F. Dew point will be around 42F with an average humidity of 49%. Winds will be 6 mph from the W.
    Night Details
    Clear. Low temperature around 46F. Dew point will be around 41F with an average humidity of 62%. Winds will be 6 mph from the S.