Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 3°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
29th Jan
3

-3

3

1
Friday
30th Jan
-3

-9

0

1
Saturday
31st Jan
7

-5

5

2
Sunday
1st Feb
8

-2

7

2
Monday
2nd Feb
7

-2

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 3°C, 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 16 kph from the north-west.

3
°C maximum temperature
-3
°C 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
-1
°C wind chill
16
kph 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 -3°C, 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 9 kph from the south-west.

-3
°C maximum temperature
-9
°C 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
-7
°C wind chill
9
kph 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 7°C, 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 17 kph from the north-west.

7
°C maximum temperature
-5
°C 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
4
°C wind chill
17
kph wind from NW

Keystone weather for Sunday 1st February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 8°C, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the north-west.

8
°C maximum temperature
-2
°C minimum temperature
scattered clouds
7
hours of sunshine
2
UV index (Low)
0
mm of rainfall expected
5
°C wind chill
15
kph 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 7°C, 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 8 kph from the north-west.