Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 27°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
27th May
27

15

8

7
Thursday
28th May
26

16

7

8
Friday
29th May
26

15

6

8
Saturday
30th May
23

15

6

6
Sunday
31st May
24

13

8

9

5-day weather forecast updated at 04:02 on Wednesday 27th May 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 27th May 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 27°C, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 22 kph from the south-east.

27
°C maximum temperature
15
°C minimum temperature
broken clouds
8
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
27
°C wind chill
22
kph wind from SE

Keystone weather for Thursday 28th May 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 8 (Very High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 23 kph from the south.

26
°C maximum temperature
16
°C minimum temperature
broken clouds
7
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
26
°C wind chill
23
kph wind from S

Keystone weather for Friday 29th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 46% chance of some rain and a moderate breeze of 20 kph from the south.

26
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
8
UV index (Very High)
46
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
20
kph wind from S

Keystone weather for Saturday 30th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 6 (High) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 72% chance of some rain and a gentle breeze of 15 kph from the south.

23
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
6
UV index (High)
72
% chance of some rain
<10
mm of rainfall expected
23
°C wind chill
15
kph wind from S

Keystone weather for Sunday 31st May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 24°C, maximum UV of 9 (Very High) and 8 hours of bright sunshine. There are 2-5 mm of rainfall expected with 43% chance of some rain and a gentle breeze of 13 kph from the south-west.