Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 22°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
3rd Oct
22

9

11

5
Sunday
4th Oct
21

8

11

5
Monday
5th Oct
28

12

11

5
Tuesday
6th Oct
26

14

11

5
Wednesday
7th Oct
23

12

9

5

5-day weather forecast updated at 04:02 on Saturday 3rd October 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 3rd October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 22°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the north.

22
°C maximum temperature
9
°C minimum temperature
scattered clouds
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
22
°C wind chill
18
kph wind from N

Keystone weather for Sunday 4th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-east.

21
°C maximum temperature
8
°C minimum temperature
clear skies
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
21
°C wind chill
13
kph wind from SE

Keystone weather for Monday 5th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.

28
°C maximum temperature
12
°C minimum temperature
clear skies
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
L
low heat & humidity
9
kph wind from W

Keystone weather for Tuesday 6th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.

26
°C maximum temperature
14
°C minimum temperature
clear skies
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
9
kph wind from W

Keystone weather for Wednesday 7th October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the west.