Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 50°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
4th Feb
50

28

6

2
Thursday
5th Feb
61

45

10

2
Friday
6th Feb
55

37

10

3
Saturday
7th Feb
55

41

2

2
Sunday
8th Feb
59

39

10

2

5-day weather forecast updated at 04:06 on Wednesday 4th February 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 Wednesday 4th February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 50°F, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the north-west.

50
°F maximum temperature
28
°F minimum temperature
scattered clouds
6
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
45
°F wind chill
10
mph wind from NW

Keystone weather for Thursday 5th February 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 61°F, maximum UV of 2 (Low) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the north-west.

61
°F maximum temperature
45
°F minimum temperature
clear skies
10
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
61
°F wind chill
10
mph wind from NW

Keystone weather for Friday 6th February 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 3 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south.

55
°F maximum temperature
37
°F minimum temperature
clear skies
10
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
55
°F wind chill
6
mph wind from S

Keystone weather for Saturday 7th February 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north-west.

55
°F maximum temperature
41
°F minimum temperature
broken clouds
2
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
9
mph wind from NW

Keystone weather for Sunday 8th February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 59°F, maximum UV of 2 (Low) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 5 mph from the west.