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.

Monday
4th May
11

3

4

5
Tuesday
5th May
6

-1

1

2
Wednesday
6th May
8

-3

5

4
Thursday
7th May
17

1

3

5
Friday
8th May
18

8

8

6

5-day weather forecast updated at 04:03 on Tuesday 5th 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 Monday 4th May 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 11°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 15% chance of some rain and a gentle breeze of 18 kph from the north-west.

11
°C maximum temperature
3
°C minimum temperature
mostly cloudy with light rain
4
hours of sunshine
5
UV index (Moderate)
15
% chance of some rain
<2
mm of rainfall expected
11
°C wind chill
18
kph wind from NW

Keystone weather for Tuesday 5th May 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 6°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the north.

6
°C maximum temperature
-1
°C minimum temperature
broken clouds
1
hour of sunshine
2
UV index (Low)
0
mm of rainfall expected
3
°C wind chill
12
kph wind from N

Keystone weather for Wednesday 6th May 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 8°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 4% chance of some sleet or snow and a light breeze of 7 kph from the north-west.

8
°C maximum temperature
-3
°C minimum temperature
cloudy with sleet or snow
5
hours of sunshine
4
UV index (Moderate)
4
% chance of some sleet or snow
<2
mm of sleet/snow expected
7
°C wind chill
7
kph wind from NW

Keystone weather for Thursday 7th May 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 48% chance of some rain and a gentle breeze of 13 kph from the north-west.

17
°C maximum temperature
1
°C minimum temperature
mostly cloudy with light rain
3
hours of sunshine
5
UV index (Moderate)
48
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
13
kph wind from NW

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 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the north.