Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 37°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
29th Jan
37

27

3

1
Friday
30th Jan
27

16

0

1
Saturday
31st Jan
45

23

5

2
Sunday
1st Feb
46

28

7

2
Monday
2nd Feb
45

28

2

2

5-day weather forecast updated at 04:03 on Thursday 29th January 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 29th January 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 37°F, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 10 mph from the north-west.

37
°F maximum temperature
27
°F minimum temperature
mostly cloudy with light rain
3
hours of sunshine
1
UV index (Low)
25
% chance of some rain
<2
mm of rainfall expected
30
°F wind chill
10
mph wind from NW

Keystone weather for Friday 30th January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 27°F, maximum UV of 1 (Low) and no hours of bright sunshine. There are 0-2 cm of snow expected with 50% chance of some snow and a light breeze of 6 mph from the south-west.

27
°F maximum temperature
16
°F minimum temperature
mostly cloudy with light snow
0
hours of sunshine
1
UV index (Low)
50
% chance of some snow
<2
cm of snow expected
19
°F wind chill
6
mph wind from SW

Keystone weather for Saturday 31st January 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 45°F, maximum UV of 2 (Low) and 5 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 30% chance of some sleet or snow and a gentle breeze of 11 mph from the north-west.

45
°F maximum temperature
23
°F minimum temperature
cloudy with sleet or snow
5
hours of sunshine
2
UV index (Low)
30
% chance of some sleet or snow
<2
mm of sleet/snow expected
39
°F wind chill
11
mph wind from NW

Keystone weather for Sunday 1st February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 46°F, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north-west.

46
°F maximum temperature
28
°F minimum temperature
scattered clouds
7
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
41
°F wind chill
9
mph wind from NW

Keystone weather for Monday 2nd February 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 45°F, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 25% chance of some snow and a light breeze of 5 mph from the north-west.