Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 66°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

5-day weather forecast updated at 04:02 on Saturday 23rd May 2026 GMT

More about Keystone

Keystone by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for South Dakota

  • Save EXTRA 5% on airport transfers worldwide
  • Book private taxis & shuttle buses with discount code
  • Enter in coupon box on 'Reservations' page
Show discount codeShow discount code ******WEB

Expires at 23:59 on Thursday 31st Dec 2026

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 23rd May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 66°F, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 4 mph from the west.

  • 66°F maximum temperature66
    °F maximum temperature
  • 43°F minimum temperature43
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 6 (High)UV6
    UV index (High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 66°F wind chill66
    °F wind chill
  • Light breeze of 4 mph from the West4
    mph wind from W

Back to top

Keystone weather for Sunday 24th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 77°F, maximum UV of 8 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a light breeze of 5 mph from the west.

  • 77°F maximum temperature77
    °F maximum temperature
  • 48°F minimum temperature48
    °F minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 7 hours of bright sunshine7
    hours of sunshine
  • UV (maximum) index 8 (Very High)UV8
    UV index (Very High)
  • 12% chance of some rain12
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 77°F wind chill77
    °F wind chill
  • Light breeze of 5 mph from the West5
    mph wind from W

Back to top

Keystone weather for Monday 25th May 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 84°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-east.

  • 84°F maximum temperature84
    °F maximum temperature
  • 55°F minimum temperature55
    °F minimum temperature
  • Clear skies
    clear skies
  • 14 hours of bright sunshine14
    hours of sunshine
  • UV (maximum) index 8 (Very High)UV8
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Light breeze of 7 mph from the South-East7
    mph wind from SE

Back to top

Keystone weather for Tuesday 26th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 14 mph from the south.

  • 82°F maximum temperature82
    °F maximum temperature
  • 61°F minimum temperature61
    °F minimum temperature
  • Scattered clouds
    scattered clouds
  • 12 hours of bright sunshine12
    hours of sunshine
  • UV (maximum) index 8 (Very High)UV8
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • Low heat & humidityL
    low heat & humidity
  • Moderate breeze of 14 mph from the South14
    mph wind from S

Back to top

Keystone weather for Wednesday 27th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 73°F, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 73% chance of some rain and a moderate breeze of 13 mph from the south-east.

  • 73°F maximum temperature73
    °F maximum temperature
  • 59°F minimum temperature59
    °F minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 9 hours of bright sunshine9
    hours of sunshine
  • UV (maximum) index 7 (High)UV7
    UV index (High)
  • 73% chance of some rain73
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 73°F wind chill73
    °F wind chill
  • Moderate breeze of 13 mph from the South-East13
    mph wind from SE

Back to top

  • Save EXTRA 5% on airport transfers worldwide
  • Book private taxis & shuttle buses with discount code
  • Enter in coupon box on 'Reservations' page
Show discount codeShow discount code ******WEB

Expires at 23:59 on Thursday 31st Dec 2026

More about the USA

Related posts

Popular travel offers

Explore holiday destinations

More holidays

Save with latest deals & discounts

More deals

Airport parking

More parking

Airport lounges

More lounges

Top ^