Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 23°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Friday
2nd Oct
23

7

12

5
Saturday
3rd Oct
21

9

8

4
Sunday
4th Oct
20

7

11

5
Monday
5th Oct
27

12

10

5
Tuesday
6th Oct
26

14

10

5

5-day weather forecast updated at 04:02 on Friday 2nd 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 Friday 2nd October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south.

23
°C maximum temperature
7
°C minimum temperature
clear skies
12
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
23
°C wind chill
11
kph wind from S

Keystone weather for Saturday 3rd October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the north.

21
°C maximum temperature
9
°C minimum temperature
scattered clouds
8
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
18
kph wind from N

Keystone weather for Sunday 4th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south.

20
°C maximum temperature
7
°C minimum temperature
clear skies
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
20
°C wind chill
14
kph wind from S

Keystone weather for Monday 5th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.

27
°C maximum temperature
12
°C minimum temperature
clear skies
10
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 scattered clouds in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 5 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the west.