Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 72°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
30th May
72

57

3

6
Sunday
31st May
68

54

12

8
Monday
1st Jun
72

50

15

8
Tuesday
2nd Jun
75

54

8

9
Wednesday
3rd Jun
75

55

6

9

5-day weather forecast updated at 04:03 on Saturday 30th 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 Saturday 30th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 72°F, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 95% chance of some rain and a light breeze of 7 mph from the south-east.

72
°F maximum temperature
57
°F minimum temperature
isolated thunderstorms
3
hours of sunshine
6
UV index (High)
95
% chance of some rain
<10
mm of rainfall expected
72
°F wind chill
7
mph wind from SE

Keystone weather for Sunday 31st May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 68°F, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 5-10 mm of rainfall expected with 63% chance of some rain and a gentle breeze of 9 mph from the north-west.

68
°F maximum temperature
54
°F minimum temperature
isolated thunderstorms
12
hours of sunshine
8
UV index (Very High)
63
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
9
mph wind from NW

Keystone weather for Monday 1st June 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 72°F, maximum UV of 8 (Very High) and 15 hours of bright sunshine. There are 0-2 mm of rainfall expected with 49% chance of some rain and a light breeze of 7 mph from the south-east.

72
°F maximum temperature
50
°F minimum temperature
sunshine and showers
15
hours of sunshine
8
UV index (Very High)
49
% chance of some rain
<2
mm of rainfall expected
72
°F wind chill
7
mph wind from SE

Keystone weather for Tuesday 2nd June 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 75°F, maximum UV of 9 (Very High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south.

75
°F maximum temperature
54
°F minimum temperature
broken clouds
8
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
75
°F wind chill
9
mph wind from S

Keystone weather for Wednesday 3rd June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 75°F, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 65% chance of some rain and a light breeze of 6 mph from the east.