Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 61°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
5th Feb
61

45

9

3
Friday
6th Feb
54

39

10

3
Saturday
7th Feb
57

41

4

2
Sunday
8th Feb
59

41

6

2
Monday
9th Feb
52

36

0

2

5-day weather forecast updated at 04:06 on Thursday 5th 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 Thursday 5th February 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 61°F, maximum UV of 3 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 11 mph from the north-west.

61
°F maximum temperature
45
°F minimum temperature
clear skies
9
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
11
mph wind from NW

Keystone weather for Friday 6th February 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 54°F, maximum UV of 3 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south-east.

54
°F maximum temperature
39
°F minimum temperature
clear skies
10
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
6
mph wind from SE

Keystone weather for Saturday 7th February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 57°F, maximum UV of 2 (Low) and 4 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north-west.

57
°F maximum temperature
41
°F minimum temperature
scattered clouds
4
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
9
mph wind from NW

Keystone weather for Sunday 8th February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 59°F, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the west.

59
°F maximum temperature
41
°F minimum temperature
scattered clouds
6
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
6
mph wind from W

Keystone weather for Monday 9th February 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 52°F, maximum UV of 2 (Low) and no hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 24% chance of some sleet or snow and a light breeze of 6 mph from the west.