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.

Thursday
8th Oct
23

9

11

5
Friday
9th Oct
28

12

11

4
Saturday
10th Oct
26

12

10

4
Sunday
11th Oct
11

4

1

1
Monday
12th Oct
7

3

0

3

5-day weather forecast updated at 04:02 on Thursday 8th 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 Thursday 8th October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the east.

23
°C maximum temperature
9
°C minimum temperature
scattered clouds
11
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
8
kph wind from E

Keystone weather for Friday 9th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the south-west.

28
°C maximum temperature
12
°C minimum temperature
clear skies
11
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
L
low heat & humidity
19
kph wind from SW

Keystone weather for Saturday 10th October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the west.

26
°C maximum temperature
12
°C minimum temperature
scattered clouds
10
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
26
°C wind chill
19
kph wind from W

Keystone weather for Sunday 11th October 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 11°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 34% chance of some rain and a light breeze of 11 kph from the north-east.

11
°C maximum temperature
4
°C minimum temperature
mostly cloudy with light rain
1
hour of sunshine
1
UV index (Low)
34
% chance of some rain
<2
mm of rainfall expected
11
°C wind chill
11
kph wind from NE

Keystone weather for Monday 12th October 2026

Expect cloudy with some rain in Keystone, South Dakota with a maximum temperature of 7°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 44% chance of some rain and a light breeze of 7 kph from the north-east.