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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.
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Thursday
18th Sep -
Friday
19th Sep -
Saturday
20th Sep -
Sunday
21st Sep -
Monday
22nd Sep
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.
- °F maximum temperature
- °F minimum temperature
- mostly cloudy with light rain
- hours of sunshine
- UV index (Moderate)
- % chance of some rain
- mm of rainfall expected
- °F wind chill
- mph wind from N
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.
- °F maximum temperature
- °F minimum temperature
- sunshine and showers
- hours of sunshine
- UV index (Moderate)
- % chance of some rain
- mm of rainfall expected
- no heat & humidity
- mph wind from E
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.
- °F maximum temperature
- °F minimum temperature
- broken clouds
- hours of sunshine
- UV index (High)
- mm of rainfall expected
- °F wind chill
- mph wind from SE
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.
- °F maximum temperature
- °F minimum temperature
- clear skies
- hours of sunshine
- UV index (High)
- mm of rainfall expected
- °F wind chill
- mph wind from W
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.
- °F maximum temperature
- °F minimum temperature
- sunshine and showers
- hours of sunshine
- UV index (High)
- % chance of some rain
- mm of rainfall expected
- no heat & humidity
- mph wind from NW
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