Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 48°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Sunday
21st Dec
48

25

2

1
Monday
22nd Dec
57

37

6

1
Tuesday
23rd Dec
55

37

4

1
Wednesday
24th Dec
59

48

8

1
Thursday
25th Dec
54

37

5

1

5-day weather forecast updated at 04:03 on Sunday 21st 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 Sunday 21st 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 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 15% chance of some rain and a moderate breeze of 12 mph from the west.

48
°F maximum temperature
25
°F minimum temperature
mostly cloudy with light rain
2
hours of sunshine
1
UV index (Low)
15
% chance of some rain
<2
mm of rainfall expected
43
°F wind chill
12
mph wind from W

Keystone weather for Monday 22nd December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 57°F, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 16 mph from the west.

57
°F maximum temperature
37
°F minimum temperature
scattered clouds
6
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
16
mph wind from W

Keystone weather for Tuesday 23rd December 2025

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 1 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south-west.

55
°F maximum temperature
37
°F minimum temperature
broken clouds
4
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
55
°F wind chill
9
mph wind from SW

Keystone weather for Wednesday 24th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 59°F, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 16 mph from the west.

59
°F maximum temperature
48
°F minimum temperature
scattered clouds
8
hours of sunshine
1
UV index (Low)
0
mm of rainfall expected
59
°F wind chill
16
mph wind from W

Keystone weather for Thursday 25th December 2025

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 54°F, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 17 mph from the west.