Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 28°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Monday
3rd Aug
28

14

12

8
Tuesday
4th Aug
20

11

5

4
Wednesday
5th Aug
24

11

8

4
Thursday
6th Aug
28

14

12

8
Friday
7th Aug
31

17

12

8

5-day weather forecast updated at 04:03 on Monday 3rd August 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 3rd August 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the north.

28
°C maximum temperature
14
°C minimum temperature
scattered clouds
12
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
23
kph wind from N

Keystone weather for Tuesday 4th August 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south-east.

20
°C maximum temperature
11
°C minimum temperature
broken clouds
5
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
10
kph wind from SE

Keystone weather for Wednesday 5th August 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 24°C, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the west.

24
°C maximum temperature
11
°C minimum temperature
broken clouds
8
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
24
°C wind chill
7
kph wind from W

Keystone weather for Thursday 6th August 2026

28
°C maximum temperature
14
°C minimum temperature
scattered clouds
12
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
8
kph wind from W

Keystone weather for Friday 7th August 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 31°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.