Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 61°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 18th September 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 18th September 2025

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 61°F, maximum UV of 4 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 36% chance of some rain and a light breeze of 7 mph from the north.

  • 61°F maximum temperature61
    °F maximum temperature
  • 48°F minimum temperature48
    °F minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 4 hours of bright sunshine4
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 36% chance of some rain36
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 61°F wind chill61
    °F wind chill
  • Light breeze of 7 mph from the North7
    mph wind from N

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Keystone weather for Friday 19th September 2025

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 64°F, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 10% chance of some rain and a light breeze of 5 mph from the east.

  • 64°F maximum temperature64
    °F maximum temperature
  • 46°F minimum temperature46
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 6 hours of bright sunshine6
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 10% chance of some rain10
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 5 mph from the East5
    mph wind from E

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Keystone weather for Saturday 20th September 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 73°F, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 5 mph from the south-east.

  • 73°F maximum temperature73
    °F maximum temperature
  • 50°F minimum temperature50
    °F minimum temperature
  • Broken clouds
    broken clouds
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 73°F wind chill73
    °F wind chill
  • Light breeze of 5 mph from the South-East5
    mph wind from SE

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Keystone weather for Sunday 21st September 2025

Expect clear skies in Keystone, South Dakota with a maximum temperature of 79°F, maximum UV of 6 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the west.

  • 79°F maximum temperature79
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Clear skies
    clear skies
  • 10 hours of bright sunshine10
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 79°F wind chill79
    °F wind chill
  • Light breeze of 6 mph from the West6
    mph wind from W

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Keystone weather for Monday 22nd September 2025

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 63°F, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 43% chance of some rain and a gentle breeze of 10 mph from the north-west.

  • 63°F maximum temperature63
    °F maximum temperature
  • 50°F minimum temperature50
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 43% chance of some rain43
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 10 mph from the North-West10
    mph wind from NW

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