Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 45°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
25th Feb
45

32

5

2
Thursday
26th Feb
50

30

11

3
Friday
27th Feb
54

28

5

4
Saturday
28th Feb
32

19

5

3
Sunday
1st Mar
39

19

10

2

5-day weather forecast updated at 04:05 on Wednesday 25th 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 25th February 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 45°F, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 59% chance of some sleet or snow and a gentle breeze of 11 mph from the north-west.

45
°F maximum temperature
32
°F minimum temperature
cloudy with sleet or snow
5
hours of sunshine
2
UV index (Low)
59
% chance of some sleet or snow
<2
mm of sleet/snow expected
39
°F wind chill
11
mph wind from NW

Keystone weather for Thursday 26th February 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 50°F, maximum UV of 3 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the west.

50
°F maximum temperature
30
°F minimum temperature
clear skies
11
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
45
°F wind chill
10
mph wind from W

Keystone weather for Friday 27th February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 54°F, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 11 mph from the west.

54
°F maximum temperature
28
°F minimum temperature
scattered clouds
5
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
54
°F wind chill
11
mph wind from W

Keystone weather for Saturday 28th February 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 32°F, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0 cm of snow expected and a light breeze of 6 mph from the east.

32
°F maximum temperature
19
°F minimum temperature
broken clouds
5
hours of sunshine
3
UV index (Moderate)
0
cm of snow expected
25
°F wind chill
6
mph wind from E

Keystone weather for Sunday 1st March 2026

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 39°F, maximum UV of 2 (Low) and 10 hours of bright sunshine. There are 0-2 cm of snow expected with 8% chance of some snow and a light breeze of 5 mph from the east.