Keystone weather live forecast

Tomorrow's maximum temperature in Keystone is expected to be 75°F.

5-day weather forecast updated at 04:03 on Monday 16th June 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 Monday 16th June 2025

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 75°F, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 10-20 mm of rainfall expected with 74% chance of some rain and a light breeze of 6 mph from the north-east.

  • 75°F maximum temperature75
    °F maximum temperature
  • 59°F minimum temperature59
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 74% chance of some rain74
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 6 mph from the North-East6
    mph wind from NE

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Keystone weather for Tuesday 17th June 2025

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 63°F, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 99% chance of some rain and a light breeze of 5 mph from the north-east.

  • 63°F maximum temperature63
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 99% chance of some rain99
    % chance of some rain
  • 10-20 mm of rainfall expected<20
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 5 mph from the North-East5
    mph wind from NE

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Keystone weather for Wednesday 18th June 2025

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 73°F, maximum UV of 9 (Very High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 24% chance of some rain and a light breeze of 4 mph from the west.

  • 73°F maximum temperature73
    °F maximum temperature
  • 52°F minimum temperature52
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 11 hours of bright sunshine11
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 24% chance of some rain24
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 4 mph from the West4
    mph wind from W

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Keystone weather for Thursday 19th June 2025

Expect clear skies in Keystone, South Dakota with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south.

  • 82°F maximum temperature82
    °F maximum temperature
  • 57°F minimum temperature57
    °F minimum temperature
  • Clear skies
    clear skies
  • 15 hours of bright sunshine15
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 6 mph from the South6
    mph wind from S

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Keystone weather for Friday 20th June 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 84°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south-west.

  • 84°F maximum temperature84
    °F maximum temperature
  • 64°F minimum temperature64
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 15 hours of bright sunshine15
    hours of sunshine
  • UV (maximum) index 9 (Very High)9
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 6 mph from the South-West6
    mph wind from SW

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