Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 68°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

5-day weather forecast updated at 04:03 on Saturday 4th October 2025 GMT

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

Keystone weather forecast by day

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

Keystone weather for Saturday 4th October 2025

Expect mostly cloudy with rain in Keystone, South Dakota with a maximum temperature of 68°F, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 99% chance of some rain and a light breeze of 7 mph from the north-west.

  • 68°F maximum temperature68
    °F maximum temperature
  • 50°F minimum temperature50
    °F minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 99% chance of some rain99
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 68°F wind chill68
    °F wind chill
  • Light breeze of 7 mph from the North-West7
    mph wind from NW

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Keystone weather for Sunday 5th October 2025

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 50°F, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 54% chance of some rain and a moderate breeze of 14 mph from the north.

  • 50°F maximum temperature50
    °F maximum temperature
  • 39°F minimum temperature39
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 54% chance of some rain54
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 45°F wind chill45
    °F wind chill
  • Moderate breeze of 14 mph from the North14
    mph wind from N

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Keystone weather for Monday 6th October 2025

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 48°F, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 46% chance of some rain and a light breeze of 6 mph from the south.

  • 48°F maximum temperature48
    °F maximum temperature
  • 37°F minimum temperature37
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 46% chance of some rain46
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 45°F wind chill45
    °F wind chill
  • Light breeze of 6 mph from the South6
    mph wind from S

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Keystone weather for Tuesday 7th October 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 57°F, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south.

  • 57°F maximum temperature57
    °F maximum temperature
  • 36°F minimum temperature36
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    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 6 mph from the South6
    mph wind from S

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Keystone weather for Wednesday 8th October 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 66°F, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south.

  • 66°F maximum temperature66
    °F maximum temperature
  • 45°F minimum temperature45
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 66°F wind chill66
    °F wind chill
  • Gentle breeze of 9 mph from the South9
    mph wind from S

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