Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 66°F. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

5-day weather forecast updated at 04:05 on Friday 5th September 2025 GMT

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The 5-day weather forecast for Montana (Lewistown) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Lewistown weather forecast by day

Below are the detailed weather forecasts for Lewistown for the next 5 days.

Lewistown weather for Friday 5th September 2025

Expect clear skies in Lewistown, Montana with a maximum temperature of 66°F, maximum UV of 5 (Moderate) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-east.

  • 66°F maximum temperature66
    °F maximum temperature
  • 43°F minimum temperature43
    °F minimum temperature
  • Clear skies
    clear skies
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 7 mph from the South-East7
    mph wind from SE

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Lewistown weather for Saturday 6th September 2025

Expect clear skies in Lewistown, Montana with a maximum temperature of 75°F, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south-east.

  • 75°F maximum temperature75
    °F maximum temperature
  • 43°F minimum temperature43
    °F minimum temperature
  • Clear skies
    clear skies
  • 13 hours of bright sunshine13
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 9 mph from the South-East9
    mph wind from SE

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Lewistown weather for Sunday 7th September 2025

Expect sunshine and showers in Lewistown, Montana with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 10% chance of some rain and a light breeze of 7 mph from the south.

  • 82°F maximum temperature82
    °F maximum temperature
  • 46°F minimum temperature46
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 10% chance of some rain10
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 7 mph from the South7
    mph wind from S

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Lewistown weather for Monday 8th September 2025

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 11 mph from the north-west.

  • 81°F maximum temperature81
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 11 mph from the North-West11
    mph wind from NW

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Lewistown weather for Tuesday 9th September 2025

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 31% chance of some rain and a gentle breeze of 11 mph from the south-east.

  • 82°F maximum temperature82
    °F maximum temperature
  • 54°F minimum temperature54
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 31% chance of some rain31
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Gentle breeze of 11 mph from the South-East11
    mph wind from SE

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