Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 57°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Sunday
15th Feb
57

32

5

3
Monday
16th Feb
57

37

7

2
Tuesday
17th Feb
55

36

3

2
Wednesday
18th Feb
41

21

3

2
Thursday
19th Feb
21

9

4

2

5-day weather forecast updated at 04:05 on Sunday 15th February 2026 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 15th February 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 57°F, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 8 mph from the west.

57
°F maximum temperature
32
°F minimum temperature
broken clouds
5
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
57
°F wind chill
8
mph wind from W

Keystone weather for Monday 16th February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 57°F, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south-west.

57
°F maximum temperature
37
°F minimum temperature
scattered clouds
7
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
57
°F wind chill
6
mph wind from SW

Keystone weather for Tuesday 17th February 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 22% chance of some rain and a fresh breeze of 18 mph from the west.

55
°F maximum temperature
36
°F minimum temperature
mostly cloudy with light rain
3
hours of sunshine
2
UV index (Low)
22
% chance of some rain
<2
mm of rainfall expected
55
°F wind chill
18
mph wind from W

Keystone weather for Wednesday 18th February 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 41°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 34% chance of some snow and a gentle breeze of 11 mph from the west.

41
°F maximum temperature
21
°F minimum temperature
mostly cloudy with light snow
3
hours of sunshine
2
UV index (Low)
34
% chance of some snow
<2
cm of snow expected
36
°F wind chill
11
mph wind from W

Keystone weather for Thursday 19th February 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 21°F, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 2-5 cm of snow expected with 62% chance of some snow and a light breeze of 5 mph from the north.