Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 36°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 Friday 5th 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 Friday 5th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 36°F, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 11 mph from the north-west.

  • 36°F maximum temperature36
    °F maximum temperature
  • 23°F minimum temperature23
    °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
  • 27°F wind chill27
    °F wind chill
  • Gentle breeze of 11 mph from the North-West11
    mph wind from NW

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Keystone weather for Saturday 6th December 2025

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 36°F, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 23% chance of some sleet or snow and a gentle breeze of 9 mph from the north-west.

  • 36°F maximum temperature36
    °F maximum temperature
  • 19°F minimum temperature19
    °F minimum temperature
  • Cloudy with sleet or snow
    cloudy with sleet or snow
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 23% chance of some sleet or snow23
    % 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 9 mph from the North-West9
    mph wind from NW

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Keystone weather for Sunday 7th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 37°F, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.

  • 37°F maximum temperature37
    °F maximum temperature
  • 19°F minimum temperature19
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 30°F wind chill30
    °F wind chill
  • Gentle breeze of 9 mph from the West9
    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 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 12 mph from the west.

  • 43°F maximum temperature43
    °F maximum temperature
  • 30°F minimum temperature30
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 36°F wind chill36
    °F wind chill
  • Moderate breeze of 12 mph from the West12
    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 and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 47% chance of some rain and a moderate breeze of 16 mph from the west.

  • 48°F maximum temperature48
    °F maximum temperature
  • 36°F minimum temperature36
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 5 hours of bright sunshine5
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 47% chance of some rain47
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 43°F wind chill43
    °F wind chill
  • Moderate breeze of 16 mph from the West16
    mph wind from W

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