Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 27°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
21st Jan
27

16

8

1
Thursday
22nd Jan
21

0

3

2
Friday
23rd Jan
1

-6

2

1
Saturday
24th Jan
18

-2

3

2
Sunday
25th Jan
23

5

1

1

5-day weather forecast updated at 04:04 on Wednesday 21st 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 Wednesday 21st January 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 27°F, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0 cm of snow expected and a fresh breeze of 18 mph from the north-west.

27
°F maximum temperature
16
°F minimum temperature
scattered clouds
8
hours of sunshine
1
UV index (Low)
0
cm of snow expected
14
°F wind chill
18
mph wind from NW

Keystone weather for Thursday 22nd January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 21°F, maximum UV of 2 (Low) and 3 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.

21
°F maximum temperature
0
°F minimum temperature
mostly cloudy with light snow
3
hours of sunshine
2
UV index (Low)
25
% chance of some snow
<2
cm of snow expected
14
°F wind chill
5
mph wind from N

Keystone weather for Friday 23rd January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 1°F, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 0-2 cm of snow expected with 34% chance of some snow and a light breeze of 5 mph from the south-east.

1
°F maximum temperature
-6
°F minimum temperature
mostly cloudy with light snow
2
hours of sunshine
1
UV index (Low)
34
% chance of some snow
<2
cm of snow expected
-8
°F wind chill
5
mph wind from SE

Keystone weather for Saturday 24th January 2026

Expect mostly cloudy with light snow in Keystone, South Dakota with a maximum temperature of 18°F, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 cm of snow expected with 11% chance of some snow and a light breeze of 6 mph from the north-west.

18
°F maximum temperature
-2
°F minimum temperature
mostly cloudy with light snow
3
hours of sunshine
2
UV index (Low)
11
% chance of some snow
<2
cm of snow expected
10
°F wind chill
6
mph wind from NW

Keystone weather for Sunday 25th January 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 23°F, maximum UV of 1 (Low) and 1 hour of bright sunshine. There are 0 cm of snow expected and a light breeze of 5 mph from the north-west.