Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 4°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Friday
17th Apr
4

-3

6

4
Saturday
18th Apr
8

-3

9

5
Sunday
19th Apr
17

0

13

7
Monday
20th Apr
24

5

12

6
Tuesday
21st Apr
25

9

9

6

5-day weather forecast updated at 04:12 on Friday 17th April 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 Friday 17th April 2026

Expect clear skies with flurries of snow in Keystone, South Dakota with a maximum temperature of 4°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0-2 cm of snow expected with 9% chance of some snow and a moderate breeze of 21 kph from the north-west.

4
°C maximum temperature
-3
°C minimum temperature
clear skies with flurries of snow
6
hours of sunshine
4
UV index (Moderate)
9
% chance of some snow
<2
cm of snow expected
-1
°C wind chill
21
kph wind from NW

Keystone weather for Saturday 18th April 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 8°C, maximum UV of 5 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the north-west.

8
°C maximum temperature
-3
°C minimum temperature
scattered clouds
9
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
5
°C wind chill
20
kph wind from NW

Keystone weather for Sunday 19th April 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

17
°C maximum temperature
0
°C minimum temperature
scattered clouds
13
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
17
°C wind chill
11
kph wind from SE

Keystone weather for Monday 20th April 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 24°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the west.

24
°C maximum temperature
5
°C minimum temperature
scattered clouds
12
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
24
°C wind chill
12
kph wind from W

Keystone weather for Tuesday 21st April 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south.