Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 29°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
13th May
29

10

13

8
Thursday
14th May
23

12

9

8
Friday
15th May
23

10

13

8
Saturday
16th May
24

9

11

8
Sunday
17th May
16

7

0

6

5-day weather forecast updated at 04:02 on Wednesday 13th 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 13th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the south.

29
°C maximum temperature
10
°C minimum temperature
scattered clouds
13
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
16
kph wind from S

Keystone weather for Thursday 14th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-west.

23
°C maximum temperature
12
°C minimum temperature
scattered clouds
9
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
0
no heat & humidity
14
kph wind from NW

Keystone weather for Friday 15th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 8 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.

23
°C maximum temperature
10
°C minimum temperature
scattered clouds
13
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
23
°C wind chill
9
kph wind from W

Keystone weather for Saturday 16th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 24°C, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a light breeze of 10 kph from the south-east.

24
°C maximum temperature
9
°C minimum temperature
sunshine and showers
11
hours of sunshine
8
UV index (Very High)
12
% chance of some rain
<2
mm of rainfall expected
24
°C wind chill
10
kph wind from SE

Keystone weather for Sunday 17th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 16°C, maximum UV of 6 (High) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 56% chance of some rain and a moderate breeze of 20 kph from the north.