Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 64°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Sunday
10th May
64

43

8

5
Monday
11th May
82

48

11

7
Tuesday
12th May
70

52

7

7
Wednesday
13th May
82

48

10

8
Thursday
14th May
79

57

13

6

5-day weather forecast updated at 04:02 on Sunday 10th 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 Sunday 10th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 64°F, maximum UV of 5 (Moderate) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 4 mph from the east.

64
°F maximum temperature
43
°F minimum temperature
scattered clouds
8
hours of sunshine
5
UV index (Moderate)
0
mm of rainfall expected
64
°F wind chill
4
mph wind from E

Keystone weather for Monday 11th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the north.

82
°F maximum temperature
48
°F minimum temperature
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
9
mph wind from N

Keystone weather for Tuesday 12th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 70°F, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the north-west.

70
°F maximum temperature
52
°F minimum temperature
scattered clouds
7
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
7
mph wind from NW

Keystone weather for Wednesday 13th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south.

82
°F maximum temperature
48
°F minimum temperature
scattered clouds
10
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
9
mph wind from S

Keystone weather for Thursday 14th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 79°F, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0-2 mm of rainfall expected with 11% chance of some rain and a gentle breeze of 11 mph from the west.