Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 19°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
13th Dec
19

10

3

1
Sunday
14th Dec
54

21

9

2
Monday
15th Dec
55

39

9

1
Tuesday
16th Dec
55

41

6

1
Wednesday
17th Dec
48

32

3

1

5-day weather forecast updated at 04:05 on Friday 12th 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 mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 19°F, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 4% chance of some snow and a light breeze of 4 mph from the north-east.

19
°F maximum temperature
10
°F minimum temperature
mostly cloudy with light snow
3
hours of sunshine
1
UV index (Low)
4
% chance of some snow
<2
cm of snow expected
12
°F wind chill
4
mph wind from NE

Keystone weather for Sunday 14th December 2025

Expect clear skies in Keystone, South Dakota with a maximum temperature of 54°F, maximum UV of 2 (Low) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.

54
°F maximum temperature
21
°F minimum temperature
clear skies
9
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
54
°F wind chill
9
mph wind from W

Keystone weather for Monday 15th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 1 (Low) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the west.

55
°F maximum temperature
39
°F minimum temperature
scattered clouds
9
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
55
°F wind chill
9
mph wind from W

Keystone weather for Tuesday 16th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the west.

55
°F maximum temperature
41
°F minimum temperature
scattered clouds
6
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
55
°F wind chill
10
mph wind from W

Keystone weather for Wednesday 17th December 2025

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 48°F, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 36% chance of some rain and a moderate breeze of 14 mph from the west.