Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 2°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 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 2°C, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the north-west.

  • 2°C maximum temperature2
    °C maximum temperature
  • -5°C minimum temperature-5
    °C 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
  • -3°C wind chill-3
    °C wind chill
  • Gentle breeze of 18 kph from the North-West18
    kph 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 2°C, 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 15 kph from the north-west.

  • 2°C maximum temperature2
    °C maximum temperature
  • -7°C minimum temperature-7
    °C 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
  • -1°C wind chill-1
    °C wind chill
  • Gentle breeze of 15 kph from the North-West15
    kph 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 3°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the west.

  • 3°C maximum temperature3
    °C maximum temperature
  • -7°C minimum temperature-7
    °C 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
  • -1°C wind chill-1
    °C wind chill
  • Gentle breeze of 15 kph from the West15
    kph 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 6°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the west.

  • 6°C maximum temperature6
    °C maximum temperature
  • -1°C minimum temperature-1
    °C 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
  • 2°C wind chill2
    °C wind chill
  • Moderate breeze of 20 kph from the West20
    kph 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 9°C 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 26 kph from the west.

  • 9°C maximum temperature9
    °C maximum temperature
  • 2°C minimum temperature2
    °C 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
  • 6°C wind chill6
    °C wind chill
  • Moderate breeze of 26 kph from the West26
    kph wind from W

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

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