Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 59°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Tuesday
17th Mar
59

32

7

5
Wednesday
18th Mar
66

43

11

6
Thursday
19th Mar
70

46

10

6
Friday
20th Mar
73

48

10

6
Saturday
21st Mar
73

48

9

5

5-day weather forecast updated at 04:03 on Tuesday 17th March 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 17th March 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 59°F, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 14 mph from the north-west.

59
°F maximum temperature
32
°F minimum temperature
broken clouds
7
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
59
°F wind chill
14
mph wind from NW

Keystone weather for Wednesday 18th March 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 66°F, maximum UV of 6 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.

66
°F maximum temperature
43
°F minimum temperature
scattered clouds
11
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
9
mph wind from W

Keystone weather for Thursday 19th March 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 70°F, maximum UV of 6 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the west.

70
°F maximum temperature
46
°F minimum temperature
scattered clouds
10
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
8
mph wind from W

Keystone weather for Friday 20th March 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 73°F, maximum UV of 6 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.

73
°F maximum temperature
48
°F minimum temperature
scattered clouds
10
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
9
mph wind from W

Keystone weather for Saturday 21st March 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 73°F, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.