Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 84°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
13th May
84

50

13

8
Thursday
14th May
73

54

9

8
Friday
15th May
73

50

13

8
Saturday
16th May
75

48

11

8
Sunday
17th May
61

45

0

6

5-day weather forecast updated at 04:02 on Wednesday 13th 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 Wednesday 13th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 84°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the south.

84
°F maximum temperature
50
°F minimum temperature
scattered clouds
13
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
10
mph wind from S

Keystone weather for Thursday 14th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 73°F, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north-west.

73
°F maximum temperature
54
°F minimum temperature
scattered clouds
9
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
0
no heat & humidity
9
mph wind from NW

Keystone weather for Friday 15th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 73°F, maximum UV of 8 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the west.

73
°F maximum temperature
50
°F minimum temperature
scattered clouds
13
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
73
°F wind chill
6
mph wind from W

Keystone weather for Saturday 16th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 75°F, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 12% chance of some rain and a light breeze of 6 mph from the south-east.

75
°F maximum temperature
48
°F minimum temperature
sunshine and showers
11
hours of sunshine
8
UV index (Very High)
12
% chance of some rain
<2
mm of rainfall expected
75
°F wind chill
6
mph wind from SE

Keystone weather for Sunday 17th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 61°F, maximum UV of 6 (High) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 56% chance of some rain and a moderate breeze of 12 mph from the north.