Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 0°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
18th Dec
0

-6

6

1
Friday
19th Dec
12

1

5

1
Saturday
20th Dec
2

-3

8

1
Sunday
21st Dec
6

-3

0

1
Monday
22nd Dec
13

6

6

1

5-day weather forecast updated at 04:03 on Thursday 18th December 2025 GMT

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Recommended for South Dakota

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 18th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 0°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 cm of snow expected and a strong breeze of 50 kph from the north-west.

0
°C maximum temperature
-6
°C minimum temperature
scattered clouds
6
hours of sunshine
1
UV index (Low)
0
cm of snow expected
-8
°C wind chill
50
kph wind from NW

Keystone weather for Friday 19th December 2025

Expect broken 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.

12
°C maximum temperature
1
°C minimum temperature
broken clouds
5
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
28
kph wind from W

Keystone weather for Saturday 20th December 2025

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 2°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0-2 cm of snow expected with 11% chance of some snow and a gentle breeze of 15 kph from the west.

2
°C maximum temperature
-3
°C minimum temperature
clear skies with flurries of snow
8
hours of sunshine
1
UV index (Low)
11
% chance of some snow
<2
cm of snow expected
-2
°C wind chill
15
kph wind from W

Keystone weather for Sunday 21st December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 6°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the west.

6
°C maximum temperature
-3
°C minimum temperature
broken clouds
0
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
4
°C wind chill
14
kph wind from W

Keystone weather for Monday 22nd December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 13°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the west.