Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 4°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Monday
29th Dec
4

-11

7

1
Tuesday
30th Dec
7

0

8

1
Wednesday
31st Dec
11

0

8

1
Thursday
1st Jan
9

1

1

1
Friday
2nd Jan
8

0

8

1

5-day weather forecast updated at 04:04 on Monday 29th 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 Monday 29th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 4°C, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the west.

4
°C maximum temperature
-11
°C minimum temperature
scattered clouds
7
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
2
°C wind chill
10
kph wind from W

Keystone weather for Tuesday 30th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 7°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north-west.

7
°C maximum temperature
0
°C minimum temperature
scattered clouds
8
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
5
°C wind chill
12
kph wind from NW

Keystone weather for Wednesday 31st December 2025

Expect clear skies in Keystone, South Dakota with a maximum temperature of 11°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the west.

11
°C maximum temperature
0
°C minimum temperature
clear skies
8
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
12
kph wind from W

Keystone weather for Thursday 1st January 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 9°C, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the west.

9
°C maximum temperature
1
°C minimum temperature
broken clouds
1
hour of sunshine
1
UV index (Low)
0
mm of rainfall expected
8
°C wind chill
7
kph wind from W

Keystone weather for Friday 2nd January 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 8°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the west.