Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 14°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
7th May
14

0

5

4
Friday
8th May
18

6

7

6
Saturday
9th May
13

7

2

4
Sunday
10th May
17

5

9

4
Monday
11th May
27

9

11

8

5-day weather forecast updated at 04:02 on Friday 8th May 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 7th May 2026

Expect mostly cloudy with rain in Keystone, South Dakota with a maximum temperature of 14°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 5-10 mm of rainfall expected with 52% chance of some rain and a light breeze of 9 kph from the west.

14
°C maximum temperature
0
°C minimum temperature
mostly cloudy with rain
5
hours of sunshine
4
UV index (Moderate)
52
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
9
kph wind from W

Keystone weather for Friday 8th May 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 18°C, maximum UV of 6 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north-west.

18
°C maximum temperature
6
°C minimum temperature
broken clouds
7
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
14
kph wind from NW

Keystone weather for Saturday 9th May 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 13°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 96% chance of some rain and a light breeze of 8 kph from the north.

13
°C maximum temperature
7
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
4
UV index (Moderate)
96
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
8
kph wind from N

Keystone weather for Sunday 10th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the west.

17
°C maximum temperature
5
°C minimum temperature
scattered clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
6
kph wind from W

Keystone weather for Monday 11th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north.