Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 9°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Sunday
21st Dec
9

-4

2

1
Monday
22nd Dec
14

3

6

1
Tuesday
23rd Dec
13

3

4

1
Wednesday
24th Dec
15

9

8

1
Thursday
25th Dec
12

3

5

1

5-day weather forecast updated at 04:03 on Sunday 21st December 2025 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 21st December 2025

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 9°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 15% chance of some rain and a moderate breeze of 20 kph from the west.

9
°C maximum temperature
-4
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
1
UV index (Low)
15
% chance of some rain
<2
mm of rainfall expected
6
°C wind chill
20
kph wind from W

Keystone weather for Monday 22nd December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 14°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the west.

14
°C maximum temperature
3
°C minimum temperature
scattered clouds
6
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
26
kph wind from W

Keystone weather for Tuesday 23rd December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 13°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south-west.

13
°C maximum temperature
3
°C minimum temperature
broken clouds
4
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
13
°C wind chill
14
kph wind from SW

Keystone weather for Wednesday 24th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 15°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 26 kph from the west.

15
°C maximum temperature
9
°C minimum temperature
scattered clouds
8
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
15
°C wind chill
26
kph wind from W

Keystone weather for Thursday 25th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 12°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the west.