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.

Tuesday
12th May
21

10

11

7
Wednesday
13th May
28

9

12

8
Thursday
14th May
23

12

15

8
Friday
15th May
23

9

14

8
Saturday
16th May
25

10

6

8

5-day weather forecast updated at 04:02 on Tuesday 12th 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 Tuesday 12th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 7 (High) and 11 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
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
13
kph wind from N

Keystone weather for Wednesday 13th May 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 gentle breeze of 17 kph from the south.

28
°C maximum temperature
9
°C minimum temperature
scattered clouds
12
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
17
kph wind from S

Keystone weather for Thursday 14th May 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 8 (Very High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the west.

23
°C maximum temperature
12
°C minimum temperature
clear skies
15
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
0
no heat & humidity
18
kph wind from W

Keystone weather for Friday 15th May 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 8 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the west.

23
°C maximum temperature
9
°C minimum temperature
clear skies
14
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
23
°C wind chill
14
kph wind from W

Keystone weather for Saturday 16th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a light breeze of 11 kph from the south.