Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 50°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Monday
12th Oct
50

37

1

4
Tuesday
13th Oct
50

37

1

2
Wednesday
14th Oct
54

41

1

3
Thursday
15th Oct
55

37

6

4
Friday
16th Oct
59

32

11

4

5-day weather forecast updated at 04:02 on Tuesday 13th 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 Monday 12th October 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 50°F, maximum UV of 4 (Moderate) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 38% chance of some rain and a light breeze of 4 mph from the east.

50
°F maximum temperature
37
°F minimum temperature
mostly cloudy with light rain
1
hour of sunshine
4
UV index (Moderate)
38
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
4
mph wind from E

Keystone weather for Tuesday 13th October 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 50°F, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 2-5 mm of rainfall expected with 22% chance of some rain and little or no wind of 4 mph from the south-east.

50
°F maximum temperature
37
°F minimum temperature
mostly cloudy with light rain
1
hour of sunshine
2
UV index (Low)
22
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
4
mph wind from SE

Keystone weather for Wednesday 14th October 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 54°F, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0-2 mm of rainfall expected with 41% chance of some rain and little or no wind of 4 mph from the south-east.

54
°F maximum temperature
41
°F minimum temperature
mostly cloudy with light rain
1
hour of sunshine
3
UV index (Moderate)
41
% chance of some rain
<2
mm of rainfall expected
54
°F wind chill
4
mph wind from SE

Keystone weather for Thursday 15th October 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 55°F, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 18% chance of some rain and a moderate breeze of 16 mph from the north.

55
°F maximum temperature
37
°F minimum temperature
sunshine and showers
6
hours of sunshine
4
UV index (Moderate)
18
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
16
mph wind from N

Keystone weather for Friday 16th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 59°F, maximum UV of 4 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 12 mph from the south-west.