Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 5°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Sunday
25th Jan
5

-2

2

2
Monday
26th Jan
37

3

7

2
Tuesday
27th Jan
36

19

4

2
Wednesday
28th Jan
39

25

4

2
Thursday
29th Jan
37

23

2

2

5-day weather forecast updated at 04:03 on Sunday 25th January 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 Sunday 25th January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 5°F, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 25% chance of some snow and a light breeze of 6 mph from the north.

5
°F maximum temperature
-2
°F minimum temperature
mostly cloudy with light snow
2
hours of sunshine
2
UV index (Low)
25
% chance of some snow
<2
cm of snow expected
-4
°F wind chill
6
mph wind from N

Keystone weather for Monday 26th January 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 37°F, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0-2 mm of sleet/snow expected and a gentle breeze of 11 mph from the west.

37
°F maximum temperature
3
°F minimum temperature
cloudy with sleet or snow
7
hours of sunshine
2
UV index (Low)
<2
mm of sleet/snow expected
30
°F wind chill
11
mph wind from W

Keystone weather for Tuesday 27th January 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 36°F, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the west.

36
°F maximum temperature
19
°F minimum temperature
broken clouds
4
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
28
°F wind chill
7
mph wind from W

Keystone weather for Wednesday 28th January 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 39°F, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the west.

39
°F maximum temperature
25
°F minimum temperature
broken clouds
4
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
34
°F wind chill
7
mph wind from W

Keystone weather for Thursday 29th January 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 37°F, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the north-west.