Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be -1°C. 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 Wednesday 3rd December 2025

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of -1°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 2-5 cm of snow expected with 30% chance of some snow and a gentle breeze of 13 kph from the north.

  • -1°C maximum temperature-1
    °C maximum temperature
  • -11°C minimum temperature-11
    °C minimum temperature
  • Mostly cloudy with light snow
    mostly cloudy with light snow
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 1 (Low)1
    UV index (Low)
  • 30% chance of some snow30
    % chance of some snow
  • 2-5 cm of snow expected<5
    cm of snow expected
  • -6°C wind chill-6
    °C wind chill
  • Gentle breeze of 13 kph from the North13
    kph wind from N

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Keystone weather for Thursday 4th December 2025

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 3°C, 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 15 kph from the west.

  • 3°C maximum temperature3
    °C maximum temperature
  • -6°C minimum temperature-6
    °C 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
  • 0°C wind chill0
    °C wind chill
  • Gentle breeze of 15 kph from the West15
    kph 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 2°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north-west.

  • 2°C maximum temperature2
    °C maximum temperature
  • -4°C minimum temperature-4
    °C 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
  • -2°C wind chill-2
    °C wind chill
  • Gentle breeze of 16 kph from the North-West16
    kph 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 -3°C 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 10 kph from the north.

  • -3°C maximum temperature-3
    °C maximum temperature
  • -8°C minimum temperature-8
    °C 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
  • -7°C wind chill-7
    °C wind chill
  • Light breeze of 10 kph from the North10
    kph 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 3°C 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 12 kph from the west.

  • 3°C maximum temperature3
    °C maximum temperature
  • -8°C minimum temperature-8
    °C 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
  • -1°C wind chill-1
    °C wind chill
  • Light breeze of 12 kph from the West12
    kph wind from W

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Metric (°C / mm)  |  Imperial (°F / inches)

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