Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 45°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Monday
8th Dec
45

32

3

1
Tuesday
9th Dec
50

34

5

1
Wednesday
10th Dec
39

30

0

1
Thursday
11th Dec
39

27

0

1
Friday
12th Dec
25

12

0

1

5-day weather forecast updated at 04:04 on Monday 8th 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 8th December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 45°F, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 11 mph from the west.

45
°F maximum temperature
32
°F minimum temperature
broken clouds
3
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
39
°F wind chill
11
mph wind from W

Keystone weather for Tuesday 9th December 2025

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 50°F, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 47% chance of some rain and a moderate breeze of 17 mph from the west.

50
°F maximum temperature
34
°F minimum temperature
sunshine and showers
5
hours of sunshine
1
UV index (Low)
47
% chance of some rain
<2
mm of rainfall expected
45
°F wind chill
17
mph wind from W

Keystone weather for Wednesday 10th December 2025

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 39°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 82% chance of some rain and a gentle breeze of 9 mph from the west.

39
°F maximum temperature
30
°F minimum temperature
mostly cloudy with light rain
0
hours of sunshine
1
UV index (Low)
82
% chance of some rain
<2
mm of rainfall expected
32
°F wind chill
9
mph wind from W

Keystone weather for Thursday 11th December 2025

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 39°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 72% chance of some sleet or snow and a gentle breeze of 9 mph from the north-west.

39
°F maximum temperature
27
°F minimum temperature
cloudy with sleet or snow
0
hours of sunshine
1
UV index (Low)
72
% chance of some sleet or snow
<2
mm of sleet/snow expected
32
°F wind chill
9
mph wind from NW

Keystone weather for Friday 12th December 2025

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 25°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 cm of snow expected with 47% chance of some snow and a light breeze of 5 mph from the north.