Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 75°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
17th Oct
75

48

10

4
Sunday
18th Oct
61

41

11

4
Monday
19th Oct
59

39

10

4
Tuesday
20th Oct
70

46

11

4
Wednesday
21st Oct
68

50

10

4

5-day weather forecast updated at 04:02 on Saturday 17th October 2026 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 17th October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 75°F, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the west.

75
°F maximum temperature
48
°F minimum temperature
scattered clouds
10
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
75
°F wind chill
10
mph wind from W

Keystone weather for Sunday 18th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 61°F, maximum UV of 4 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north.

61
°F maximum temperature
41
°F minimum temperature
clear skies
11
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
61
°F wind chill
9
mph wind from N

Keystone weather for Monday 19th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 59°F, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south-east.

59
°F maximum temperature
39
°F minimum temperature
clear skies
10
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
6
mph wind from SE

Keystone weather for Tuesday 20th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 70°F, maximum UV of 4 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south-west.

70
°F maximum temperature
46
°F minimum temperature
clear skies
11
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
6
mph wind from SW

Keystone weather for Wednesday 21st October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 68°F, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the west.