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 Thursday 4th 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 Thursday 4th December 2025

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 37°F, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0-2 cm of snow expected with 3% chance of some snow and a gentle breeze of 9 mph from the west.

  • 37°F maximum temperature37
    °F maximum temperature
  • 21°F minimum temperature21
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 3% chance of some snow3
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 32°F wind chill32
    °F wind chill
  • Gentle breeze of 9 mph from the West9
    mph wind from W

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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 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the north-west.

  • 36°F maximum temperature36
    °F maximum temperature
  • 25°F minimum temperature25
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 28°F wind chill28
    °F wind chill
  • Gentle breeze of 10 mph from the North-West10
    mph wind from NW

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Keystone weather for Saturday 6th December 2025

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 27°F and 1 hour of bright sunshine. There are 0-2 cm of snow expected with 29% chance of some snow and a light breeze of 6 mph from the north.

  • 27°F maximum temperature27
    °F maximum temperature
  • 18°F minimum temperature18
    °F minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 29% chance of some snow29
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 19°F wind chill19
    °F wind chill
  • Light breeze of 6 mph from the North6
    mph wind from N

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Keystone weather for Sunday 7th December 2025

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 37°F and 6 hours of bright sunshine. There are 0-2 cm of snow expected with 4% chance of some snow and a light breeze of 7 mph from the west.

  • 37°F maximum temperature37
    °F maximum temperature
  • 18°F minimum temperature18
    °F minimum temperature
  • Clear skies with flurries of snow
    clear skies with flurries of snow
  • 6 hours of bright sunshine6
    hours of sunshine
  • No UV (maximum) index0
    UV index (None)
  • 4% chance of some snow4
    % chance of some snow
  • 0-2 cm of snow expected<2
    cm of snow expected
  • 30°F wind chill30
    °F wind chill
  • Light breeze of 7 mph from the West7
    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 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 12 mph from the north-west.

  • 43°F maximum temperature43
    °F maximum temperature
  • 30°F minimum temperature30
    °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
  • 37°F wind chill37
    °F wind chill
  • Gentle breeze of 12 mph from the North-West12
    mph wind from NW

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