Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 43°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
28th Jan
43

28

2

2
Thursday
29th Jan
37

27

1

0
Friday
30th Jan
27

18

3

1
Saturday
31st Jan
43

23

1

2
Sunday
1st Feb
46

30

3

2

5-day weather forecast updated at 04:03 on Wednesday 28th 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 Wednesday 28th January 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 43°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 west.

43
°F maximum temperature
28
°F minimum temperature
broken clouds
2
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
39
°F wind chill
6
mph wind from W

Keystone weather for Thursday 29th January 2026

Expect overcast skies in Keystone, South Dakota with a maximum temperature of 37°F and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north-west.

37
°F maximum temperature
27
°F minimum temperature
overcast skies
1
hour of sunshine
0
UV index (None)
0
mm of rainfall expected
30
°F wind chill
9
mph wind from NW

Keystone weather for Friday 30th January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 27°F, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 67% chance of some snow and a light breeze of 5 mph from the south-west.

27
°F maximum temperature
18
°F minimum temperature
mostly cloudy with light snow
3
hours of sunshine
1
UV index (Low)
67
% chance of some snow
<2
cm of snow expected
19
°F wind chill
5
mph wind from SW

Keystone weather for Saturday 31st January 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 43°F, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0-2 mm of sleet/snow expected with 8% chance of some sleet or snow and a gentle breeze of 9 mph from the north-west.

43
°F maximum temperature
23
°F minimum temperature
cloudy with sleet or snow
1
hour of sunshine
2
UV index (Low)
8
% chance of some sleet or snow
<2
mm of sleet/snow expected
37
°F wind chill
9
mph wind from NW

Keystone weather for Sunday 1st February 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 46°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the north-west.