Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 11°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Tuesday
17th Feb
11

0

3

2
Wednesday
18th Feb
5

-7

6

2
Thursday
19th Feb
-8

-14

0

1
Friday
20th Feb
-3

-15

7

2
Saturday
21st Feb
0

-10

11

2

5-day weather forecast updated at 04:06 on Tuesday 17th 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 Tuesday 17th February 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 11°C, maximum UV of 2 (Low) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 65% chance of some rain and a moderate breeze of 27 kph from the west.

11
°C maximum temperature
0
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
2
UV index (Low)
65
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
27
kph wind from W

Keystone weather for Wednesday 18th February 2026

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 5°C, maximum UV of 2 (Low) and 6 hours of bright sunshine. There are 0-2 cm of snow expected with 53% chance of some snow and a gentle breeze of 13 kph from the west.

5
°C maximum temperature
-7
°C minimum temperature
clear skies with flurries of snow
6
hours of sunshine
2
UV index (Low)
53
% chance of some snow
<2
cm of snow expected
3
°C wind chill
13
kph wind from W

Keystone weather for Thursday 19th February 2026

Expect cloudy with some snow in Keystone, South Dakota with a maximum temperature of -8°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 cm of snow expected with 85% chance of some snow and a light breeze of 12 kph from the north.

-8
°C maximum temperature
-14
°C minimum temperature
cloudy with some snow
0
hours of sunshine
1
UV index (Low)
85
% chance of some snow
<10
cm of snow expected
-13
°C wind chill
12
kph wind from N

Keystone weather for Friday 20th February 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of -3°C, maximum UV of 2 (Low) and 7 hours of bright sunshine. There are 0 cm of snow expected and a light breeze of 7 kph from the west.

-3
°C maximum temperature
-15
°C minimum temperature
broken clouds
7
hours of sunshine
2
UV index (Low)
0
cm of snow expected
-5
°C wind chill
7
kph wind from W

Keystone weather for Saturday 21st February 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 0°C, maximum UV of 2 (Low) and 11 hours of bright sunshine. There are 0 cm of snow expected and little or no wind of 6 kph from the west.