Keystone weather live forecast

Tomorrow's maximum temperature in Keystone is expected to be 11°C.

  • Thursday
    1st May
    Isolated thunderstorms (0-2 mm of rainfall expected)
  • Friday
    2nd May
    Scattered clouds
  • Saturday
    3rd May
    Clear skies
  • Sunday
    4th May
    Sunshine and showers (0-2 mm of rainfall expected)
  • Monday
    5th May
    Isolated thunderstorms (0-2 mm of rainfall expected)

5-day weather forecast updated at 04:03 on Thursday 1st May 2025 GMT

More about Keystone

Keystone by month

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

Recommended for South Dakota

Avalon Waterways: Current offers on 2025 river cruises

  • Save on river cruises in 2025 with Avalon Waterways
  • Book river cruises in Europe, Asia, Africa & Americas
  • Filter deals by promotion, month, destination & more
Go to Avalon Waterways deal >>

Expires at 23:59 on Wednesday 31st Dec 2025 · View all Avalon Waterways offers

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 1st May 2025

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 11°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 98% chance of some rain and a gentle breeze of 16 kph from the north-west.

  • 11°C maximum temperature11
    °C maximum temperature
  • 3°C minimum temperature3
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 5 hours of bright sunshine5
    hours of sunshine
  • UV (maximum) index 3 (Moderate)3
    UV index (Moderate)
  • 98% chance of some rain98
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 11°C wind chill11
    °C wind chill
  • Gentle breeze of 16 kph from the North-West16
    kph wind from NW

Back to top

Keystone weather for Friday 2nd May 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 14°C, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the north-west.

  • 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 8 (Very High)8
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 14°C wind chill14
    °C wind chill
  • Light breeze of 11 kph from the North-West11
    kph wind from NW

Back to top

Keystone weather for Saturday 3rd May 2025

Expect clear skies in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 8 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south-east.

  • 21°C maximum temperature21
    °C maximum temperature
  • 5°C minimum temperature5
    °C minimum temperature
  • Clear skies
    clear skies
  • 14 hours of bright sunshine14
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 0 mm of rainfall expected0
    mm of rainfall expected
  • 21°C wind chill21
    °C wind chill
  • Gentle breeze of 14 kph from the South-East14
    kph wind from SE

Back to top

Keystone weather for Sunday 4th May 2025

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 8 (Very High) and 14 hours of bright sunshine. There are 0-2 mm of rainfall expected with 28% chance of some rain and a moderate breeze of 20 kph from the south.

  • 23°C maximum temperature23
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Sunshine and showers
    sunshine and showers
  • 14 hours of bright sunshine14
    hours of sunshine
  • UV (maximum) index 8 (Very High)8
    UV index (Very High)
  • 28% chance of some rain28
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • 23°C wind chill23
    °C wind chill
  • Moderate breeze of 20 kph from the South20
    kph wind from S

Back to top

Keystone weather for Monday 5th May 2025

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 79% chance of some rain and a gentle breeze of 14 kph from the south.

  • 17°C maximum temperature17
    °C maximum temperature
  • 9°C minimum temperature9
    °C minimum temperature
  • Isolated thunderstorms
    isolated thunderstorms
  • 8 hours of bright sunshine8
    hours of sunshine
  • UV (maximum) index 6 (High)6
    UV index (High)
  • 79% chance of some rain79
    % chance of some rain
  • 0-2 mm of rainfall expected<2
    mm of rainfall expected
  • No heat & humidity0
    no heat & humidity
  • Gentle breeze of 14 kph from the South14
    kph wind from S

Back to top

Skyscanner: Lowest flight prices by destination

  • Explore lowest airfares by destinations worldwide
  • Find the cheapest month or filter by route or month
  • Prices shown found on Skyscanner in last 8 days
Go to Skyscanner deal >>

View all Skyscanner offers

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

Back to top

More about the USA

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^