Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 20°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

5-day weather forecast updated at 04:03 on Saturday 4th October 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 Saturday 4th October 2025

Expect mostly cloudy with rain in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 99% chance of some rain and a light breeze of 12 kph from the north-west.

  • 20°C maximum temperature20
    °C maximum temperature
  • 10°C minimum temperature10
    °C minimum temperature
  • Mostly cloudy with rain
    mostly cloudy with rain
  • 2 hours of bright sunshine2
    hours of sunshine
  • UV (maximum) index 4 (Moderate)4
    UV index (Moderate)
  • 99% chance of some rain99
    % chance of some rain
  • 5-10 mm of rainfall expected<10
    mm of rainfall expected
  • 20°C wind chill20
    °C wind chill
  • Light breeze of 12 kph from the North-West12
    kph wind from NW

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Keystone weather for Sunday 5th October 2025

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 10°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 54% chance of some rain and a moderate breeze of 22 kph from the north.

  • 10°C maximum temperature10
    °C maximum temperature
  • 4°C minimum temperature4
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 2 (Low)2
    UV index (Low)
  • 54% chance of some rain54
    % chance of some rain
  • 2-5 mm of rainfall expected<5
    mm of rainfall expected
  • 7°C wind chill7
    °C wind chill
  • Moderate breeze of 22 kph from the North22
    kph wind from N

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Keystone weather for Monday 6th October 2025

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 9°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 46% chance of some rain and a light breeze of 10 kph from the south.

  • 9°C maximum temperature9
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Mostly cloudy with light rain
    mostly cloudy with light rain
  • 1 hour of bright sunshine1
    hour of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 46% chance of some rain46
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 7°C wind chill7
    °C wind chill
  • Light breeze of 10 kph from the South10
    kph wind from S

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Keystone weather for Tuesday 7th October 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 14°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south.

  • 14°C maximum temperature14
    °C maximum temperature
  • 2°C minimum temperature2
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Light breeze of 10 kph from the South10
    kph wind from S

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Keystone weather for Wednesday 8th October 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south.

  • 19°C maximum temperature19
    °C maximum temperature
  • 7°C minimum temperature7
    °C minimum temperature
  • Scattered clouds
    scattered clouds
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 5 (Moderate)5
    UV index (Moderate)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 19°C wind chill19
    °C wind chill
  • Gentle breeze of 15 kph from the South15
    kph wind from S

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

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