Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 23°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
23rd Sep
23

13

6

6
Thursday
24th Sep
21

12

9

6
Friday
25th Sep
19

12

9

5
Saturday
26th Sep
25

13

9

5
Sunday
27th Sep
20

11

3

5

5-day weather forecast updated at 04:03 on Wednesday 23rd 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 23rd September 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-west.

23
°C maximum temperature
13
°C minimum temperature
broken clouds
6
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
11
kph wind from SW

Keystone weather for Thursday 24th September 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the east.

21
°C maximum temperature
12
°C minimum temperature
scattered clouds
9
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
8
kph wind from E

Keystone weather for Friday 25th September 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

19
°C maximum temperature
12
°C minimum temperature
scattered clouds
9
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
11
kph wind from SE

Keystone weather for Saturday 26th September 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the west.

25
°C maximum temperature
13
°C minimum temperature
scattered clouds
9
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
25
°C wind chill
15
kph wind from W

Keystone weather for Sunday 27th September 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a light breeze of 10 kph from the south-east.