Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 21°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Sunday
10th May
21

5

10

5
Monday
11th May
29

11

6

7
Tuesday
12th May
21

10

6

8
Wednesday
13th May
27

9

11

8
Thursday
14th May
28

15

14

6

5-day weather forecast updated at 04:03 on Monday 11th 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 Sunday 10th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the south-east.

21
°C maximum temperature
5
°C minimum temperature
scattered clouds
10
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
21
°C wind chill
7
kph wind from SE

Keystone weather for Monday 11th May 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 7 (High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north.

29
°C maximum temperature
11
°C minimum temperature
broken clouds
6
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
14
kph wind from N

Keystone weather for Tuesday 12th May 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the north.

21
°C maximum temperature
10
°C minimum temperature
broken clouds
6
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
21
°C wind chill
13
kph wind from N

Keystone weather for Wednesday 13th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south.

27
°C maximum temperature
9
°C minimum temperature
scattered clouds
11
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
15
kph wind from S

Keystone weather for Thursday 14th May 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 6 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the west.