Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 50°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
30th Apr
50

30

5

6
Friday
1st May
55

32

10

5
Saturday
2nd May
66

36

10

7
Sunday
3rd May
61

43

5

4
Monday
4th May
64

43

9

7

5-day weather forecast updated at 04:03 on Thursday 30th 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 Thursday 30th April 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 50°F, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the north.

50
°F maximum temperature
30
°F minimum temperature
broken clouds
5
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
46
°F wind chill
7
mph wind from N

Keystone weather for Friday 1st May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 2-5 mm of rainfall expected with 3% chance of some rain and a light breeze of 6 mph from the north-east.

55
°F maximum temperature
32
°F minimum temperature
sunshine and showers
10
hours of sunshine
5
UV index (Moderate)
3
% chance of some rain
<5
mm of rainfall expected
55
°F wind chill
6
mph wind from NE

Keystone weather for Saturday 2nd May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 66°F, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the west.

66
°F maximum temperature
36
°F minimum temperature
scattered clouds
10
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
6
mph wind from W

Keystone weather for Sunday 3rd May 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 61°F, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 47% chance of some rain and a light breeze of 5 mph from the north.

61
°F maximum temperature
43
°F minimum temperature
mostly cloudy with light rain
5
hours of sunshine
4
UV index (Moderate)
47
% chance of some rain
<5
mm of rainfall expected
61
°F wind chill
5
mph wind from N

Keystone weather for Monday 4th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 64°F, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the north.