Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 19°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
23rd May
19

6

9

UV6
Sunday
24th May
25

9

7

UV8
Monday
25th May
29

13

14

UV8
Tuesday
26th May
28

16

12

UV8
Wednesday
27th May
23

15

9

UV7

5-day weather forecast updated at 04:02 on Saturday 23rd 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 Saturday 23rd May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the west.

19
°C maximum temperature
6
°C minimum temperature
scattered clouds
9
hours of sunshine
UV6
UV index (High)
0
mm of rainfall expected
19
°C wind chill
7
kph wind from W

Keystone weather for Sunday 24th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 8 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a light breeze of 8 kph from the west.

25
°C maximum temperature
9
°C minimum temperature
sunshine and showers
7
hours of sunshine
UV8
UV index (Very High)
12
% chance of some rain
<2
mm of rainfall expected
25
°C wind chill
8
kph wind from W

Keystone weather for Monday 25th May 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south-east.

29
°C maximum temperature
13
°C minimum temperature
clear skies
14
hours of sunshine
UV8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
12
kph wind from SE

Keystone weather for Tuesday 26th 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 moderate breeze of 23 kph from the south.

28
°C maximum temperature
16
°C minimum temperature
scattered clouds
12
hours of sunshine
UV8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
23
kph wind from S

Keystone weather for Wednesday 27th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 73% chance of some rain and a moderate breeze of 21 kph from the south-east.