Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 27°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Friday
20th Feb
27

3

8

2
Saturday
21st Feb
34

14

2

2
Sunday
22nd Feb
30

10

9

3
Monday
23rd Feb
52

19

9

3
Tuesday
24th Feb
55

37

7

2

5-day weather forecast updated at 04:05 on Friday 20th 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 Friday 20th February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 27°F, maximum UV of 2 (Low) and 8 hours of bright sunshine. There are 0 cm of snow expected and little or no wind of 3 mph from the south-east.

27
°F maximum temperature
3
°F minimum temperature
scattered clouds
8
hours of sunshine
2
UV index (Low)
0
cm of snow expected
23
°F wind chill
3
mph wind from SE

Keystone weather for Saturday 21st February 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 34°F, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 4 mph from the north-west.

34
°F maximum temperature
14
°F minimum temperature
broken clouds
2
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
30
°F wind chill
4
mph wind from NW

Keystone weather for Sunday 22nd February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 30°F, maximum UV of 3 (Moderate) and 9 hours of bright sunshine. There are 0 cm of snow expected and a light breeze of 6 mph from the south-east.

30
°F maximum temperature
10
°F minimum temperature
scattered clouds
9
hours of sunshine
3
UV index (Moderate)
0
cm of snow expected
25
°F wind chill
6
mph wind from SE

Keystone weather for Monday 23rd February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 52°F, maximum UV of 3 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the west.

52
°F maximum temperature
19
°F minimum temperature
scattered clouds
9
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
52
°F wind chill
8
mph wind from W

Keystone weather for Tuesday 24th February 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the west.