Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 37°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

5-day weather forecast updated at 04:04 on Saturday 6th December 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 6th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 37°F and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the north-west.

  • 37°F maximum temperature37
    °F maximum temperature
  • 19°F minimum temperature19
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 30°F wind chill30
    °F wind chill
  • Light breeze of 7 mph from the North-West7
    mph wind from NW

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Keystone weather for Sunday 7th December 2025

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 37°F, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 6% chance of some sleet or snow and a gentle breeze of 11 mph from the west.

  • 37°F maximum temperature37
    °F maximum temperature
  • 19°F minimum temperature19
    °F minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 6% chance of some sleet or snow6
    % chance of some sleet or snow
  • 0-2 mm of sleet/snow expected<2
    mm of sleet/snow expected
  • 30°F wind chill30
    °F wind chill
  • Gentle breeze of 11 mph from the West11
    mph wind from W

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Keystone weather for Monday 8th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 43°F, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the west.

  • 43°F maximum temperature43
    °F maximum temperature
  • 30°F minimum temperature30
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 37°F wind chill37
    °F wind chill
  • Gentle breeze of 10 mph from the West10
    mph wind from W

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Keystone weather for Tuesday 9th December 2025

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 48°F, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 50% chance of some rain and a moderate breeze of 17 mph from the north-west.

  • 48°F maximum temperature48
    °F maximum temperature
  • 34°F minimum temperature34
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 50% chance of some rain50
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 41°F wind chill41
    °F wind chill
  • Moderate breeze of 17 mph from the North-West17
    mph wind from NW

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Keystone weather for Wednesday 10th December 2025

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 39°F and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and a gentle breeze of 11 mph from the west.

  • 39°F maximum temperature39
    °F maximum temperature
  • 32°F minimum temperature32
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • No hours of bright sunshine0
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 44% chance of some rain44
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 34°F wind chill34
    °F wind chill
  • Gentle breeze of 11 mph from the West11
    mph wind from W

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