Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 39°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Monday
27th Apr
39

32

0

5
Tuesday
28th Apr
39

32

2

4
Wednesday
29th Apr
52

32

5

6
Thursday
30th Apr
52

34

1

5
Friday
1st May
61

32

11

7

5-day weather forecast updated at 04:03 on Monday 27th April 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 Monday 27th April 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 39°F, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 2-5 mm of sleet/snow expected with 36% chance of some sleet or snow and a gentle breeze of 9 mph from the north.

39
°F maximum temperature
32
°F minimum temperature
cloudy with sleet or snow
0
hours of sunshine
5
UV index (Moderate)
36
% chance of some sleet or snow
<5
mm of sleet/snow expected
34
°F wind chill
9
mph wind from N

Keystone weather for Tuesday 28th April 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 39°F, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of sleet/snow expected with 97% chance of some sleet or snow and little or no wind of 4 mph from the south-east.

39
°F maximum temperature
32
°F minimum temperature
cloudy with sleet or snow
2
hours of sunshine
4
UV index (Moderate)
97
% chance of some sleet or snow
<10
mm of sleet/snow expected
37
°F wind chill
4
mph wind from SE

Keystone weather for Wednesday 29th April 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 52°F, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 42% chance of some rain and a light breeze of 6 mph from the north-west.

52
°F maximum temperature
32
°F minimum temperature
mostly cloudy with light rain
5
hours of sunshine
6
UV index (High)
42
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
6
mph wind from NW

Keystone weather for Thursday 30th April 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 52°F, maximum UV of 5 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the north.

52
°F maximum temperature
34
°F minimum temperature
broken clouds
1
hour of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
52
°F wind chill
6
mph wind from N

Keystone weather for Friday 1st May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 61°F, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south.