Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 48°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Tuesday
6th Jan
48

36

8

1
Wednesday
7th Jan
48

36

5

1
Thursday
8th Jan
37

27

3

0
Friday
9th Jan
32

25

3

1
Saturday
10th Jan
39

28

9

1

5-day weather forecast updated at 04:03 on Tuesday 6th 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 Tuesday 6th January 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 48°F, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.

48
°F maximum temperature
36
°F minimum temperature
scattered clouds
8
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
43
°F wind chill
9
mph wind from W

Keystone weather for Wednesday 7th January 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 48°F, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.

48
°F maximum temperature
36
°F minimum temperature
broken clouds
5
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
45
°F wind chill
9
mph wind from W

Keystone weather for Thursday 8th January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 37°F and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 70% chance of some snow and a light breeze of 5 mph from the north-west.

37
°F maximum temperature
27
°F minimum temperature
mostly cloudy with light snow
3
hours of sunshine
0
UV index (None)
70
% chance of some snow
<2
cm of snow expected
34
°F wind chill
5
mph wind from NW

Keystone weather for Friday 9th January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 32°F, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 2-5 cm of snow expected with 27% chance of some snow and a gentle breeze of 12 mph from the north-west.

32
°F maximum temperature
25
°F minimum temperature
mostly cloudy with light snow
3
hours of sunshine
1
UV index (Low)
27
% chance of some snow
<5
cm of snow expected
23
°F wind chill
12
mph wind from NW

Keystone weather for Saturday 10th January 2026

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 39°F, maximum UV of 1 (Low) and 9 hours of bright sunshine. There are 0-2 cm of snow expected with 18% chance of some snow and a gentle breeze of 9 mph from the north-west.