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.

Sunday
4th Oct
21

8

11

5
Monday
5th Oct
29

13

11

5
Tuesday
6th Oct
25

13

11

5
Wednesday
7th Oct
23

11

9

4
Thursday
8th Oct
20

10

8

5

5-day weather forecast updated at 04:02 on Sunday 4th 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 Sunday 4th October 2026

Expect scattered clouds 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 light breeze of 12 kph from the south-west.

21
°C maximum temperature
8
°C minimum temperature
scattered clouds
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
12
kph wind from SW

Keystone weather for Monday 5th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 29°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.

29
°C maximum temperature
13
°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 25°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.

25
°C maximum temperature
13
°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 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the west.

23
°C maximum temperature
11
°C minimum temperature
scattered clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
23
°C wind chill
8
kph wind from W

Keystone weather for Thursday 8th October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.