Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 3°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
4th Dec
3

-6

5

1
Friday
5th Dec
2

-5

7

1
Saturday
6th Dec
2

-7

4

1
Sunday
7th Dec
3

-7

5

1
Monday
8th Dec
6

-1

4

1

5-day weather forecast updated at 04:04 on Friday 5th 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 Thursday 4th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 3°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the west.

3
°C maximum temperature
-6
°C minimum temperature
broken clouds
5
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
0
°C wind chill
14
kph wind from W

Keystone weather for Friday 5th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 2°C, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the north-west.

2
°C maximum temperature
-5
°C minimum temperature
broken clouds
7
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
-3
°C wind chill
18
kph wind from NW

Keystone weather for Saturday 6th December 2025

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 2°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 23% chance of some sleet or snow and a gentle breeze of 15 kph from the north-west.

2
°C maximum temperature
-7
°C minimum temperature
cloudy with sleet or snow
4
hours of sunshine
1
UV index (Low)
23
% chance of some sleet or snow
<2
mm of sleet/snow expected
-1
°C wind chill
15
kph wind from NW

Keystone weather for Sunday 7th December 2025

3
°C maximum temperature
-7
°C minimum temperature
broken clouds
5
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
-1
°C wind chill
15
kph wind from W

Keystone weather for Monday 8th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 6°C, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the west.

6
°C maximum temperature
-1
°C minimum temperature
broken clouds
4
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
2
°C wind chill
20
kph wind from W

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Metric (°C / mm) | Imperial (°F / inches)

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South Dakota - quick facts
Flight time^✝	12.5 hours
Time difference	UK -6 to -7 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	South Dakota Department of Tourism