Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be -8°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
13th Dec
-8

-15

4

1
Sunday
14th Dec
13

-6

7

2
Monday
15th Dec
13

4

8

1
Tuesday
16th Dec
12

3

2

1
Wednesday
17th Dec
12

0

1

1

5-day weather forecast updated at 04:04 on Sunday 14th 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 Saturday 13th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of -8°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0 cm of snow expected and a light breeze of 8 kph from the north-east.

-8
°C maximum temperature
-15
°C minimum temperature
scattered clouds
4
hours of sunshine
1
UV index (Low)
0
cm of snow expected
-12
°C wind chill
8
kph wind from NE

Keystone weather for Sunday 14th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 13°C, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the west.

13
°C maximum temperature
-6
°C minimum temperature
scattered clouds
7
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
15
kph wind from W

Keystone weather for Monday 15th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 13°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the west.

13
°C maximum temperature
4
°C minimum temperature
scattered clouds
8
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
13
°C wind chill
14
kph wind from W

Keystone weather for Tuesday 16th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 12°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the west.

12
°C maximum temperature
3
°C minimum temperature
broken clouds
2
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
12
°C wind chill
14
kph wind from W

Keystone weather for Wednesday 17th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 12°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 27 kph from the north-west.