Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 22°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
30th Sep
22

11

6

5
Thursday
1st Oct
14

8

7

5
Friday
2nd Oct
17

6

5

5
Saturday
3rd Oct
19

8

7

5
Sunday
4th Oct
17

7

11

5

5-day weather forecast updated at 04:03 on Wednesday 30th September 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 30th September 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the west.

22
°C maximum temperature
11
°C minimum temperature
scattered clouds
6
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
22
°C wind chill
10
kph wind from W

Keystone weather for Thursday 1st October 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 14°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south-east.

14
°C maximum temperature
8
°C minimum temperature
broken clouds
7
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
12
kph wind from SE

Keystone weather for Friday 2nd October 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 5 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 4% chance of some rain and a light breeze of 10 kph from the south.

17
°C maximum temperature
6
°C minimum temperature
sunshine and showers
5
hours of sunshine
5
UV index (Moderate)
4
% chance of some rain
<2
mm of rainfall expected
17
°C wind chill
10
kph wind from S

Keystone weather for Saturday 3rd October 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the north.

19
°C maximum temperature
8
°C minimum temperature
broken clouds
7
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
19
°C wind chill
13
kph wind from N

Keystone weather for Sunday 4th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-east.