Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 27°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
10th Oct
27

15

9

4
Sunday
11th Oct
16

7

3

3
Monday
12th Oct
15

6

0

5
Tuesday
13th Oct
12

5

1

2
Wednesday
14th Oct
12

6

0

0

5-day weather forecast updated at 04:02 on Saturday 10th October 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 Saturday 10th October 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 18 kph from the west.

27
°C maximum temperature
15
°C minimum temperature
scattered clouds
9
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
L
low heat & humidity
18
kph wind from W

Keystone weather for Sunday 11th October 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 16°C, maximum UV of 3 (Moderate) and 3 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the north-east.

16
°C maximum temperature
7
°C minimum temperature
broken clouds
3
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
16
°C wind chill
11
kph wind from NE

Keystone weather for Monday 12th October 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 15°C, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 24% chance of some rain and a light breeze of 10 kph from the north-east.

15
°C maximum temperature
6
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
5
UV index (Moderate)
24
% chance of some rain
<2
mm of rainfall expected
15
°C wind chill
10
kph wind from NE

Keystone weather for Tuesday 13th October 2026

Expect overcast skies in Keystone, South Dakota with a maximum temperature of 12°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the south-east.

12
°C maximum temperature
5
°C minimum temperature
overcast skies
1
hour of sunshine
2
UV index (Low)
0
mm of rainfall expected
0
no heat & humidity
7
kph wind from SE

Keystone weather for Wednesday 14th October 2026

Expect mostly cloudy with rain in Keystone, South Dakota with a maximum temperature of 12°C and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 77% chance of some rain and a light breeze of 9 kph from the east.