Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 9°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
15th Jan
9

-4

7

1
Friday
16th Jan
-4

-9

6

0
Saturday
17th Jan
0

-12

8

1
Sunday
18th Jan
3

-6

4

0
Monday
19th Jan
-1

-7

6

1

5-day weather forecast updated at 04:05 on Thursday 15th 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 15th January 2026

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 9°C, maximum UV of 1 (Low) and 7 hours of bright sunshine. There are 0-2 cm of snow expected with 42% chance of some snow and a fresh breeze of 37 kph from the north-west.

9
°C maximum temperature
-4
°C minimum temperature
clear skies with flurries of snow
7
hours of sunshine
1
UV index (Low)
42
% chance of some snow
<2
cm of snow expected
4
°C wind chill
37
kph wind from NW

Keystone weather for Friday 16th January 2026

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of -4°C and 6 hours of bright sunshine. There are 0-2 cm of snow expected with 25% chance of some snow and a strong breeze of 42 kph from the north-west.

-4
°C maximum temperature
-9
°C minimum temperature
clear skies with flurries of snow
6
hours of sunshine
0
UV index (None)
25
% chance of some snow
<2
cm of snow expected
-13
°C wind chill
42
kph wind from NW

Keystone weather for Saturday 17th January 2026

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 0°C, maximum UV of 1 (Low) and 8 hours of bright sunshine. There are 0-2 cm of snow expected with 2% chance of some snow and a moderate breeze of 27 kph from the north-west.

0
°C maximum temperature
-12
°C minimum temperature
clear skies with flurries of snow
8
hours of sunshine
1
UV index (Low)
2
% chance of some snow
<2
cm of snow expected
-6
°C wind chill
27
kph wind from NW

Keystone weather for Sunday 18th January 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 3°C and 4 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 5% chance of some sleet or snow and a moderate breeze of 26 kph from the north-west.

3
°C maximum temperature
-6
°C minimum temperature
cloudy with sleet or snow
4
hours of sunshine
0
UV index (None)
5
% chance of some sleet or snow
<2
mm of sleet/snow expected
-2
°C wind chill
26
kph wind from NW

Keystone weather for Monday 19th January 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of -1°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 cm of snow expected and a gentle breeze of 15 kph from the north-west.