Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 86°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
27th Jun
86

64

11

8
Sunday
28th Jun
81

61

9

9
Monday
29th Jun
75

57

13

9
Tuesday
30th Jun
79

55

15

9
Wednesday
1st Jul
82

57

11

9

5-day weather forecast updated at 04:03 on Saturday 27th June 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 27th June 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the south-west.

86
°F maximum temperature
64
°F minimum temperature
scattered clouds
11
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
10
mph wind from SW

Keystone weather for Sunday 28th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 81°F, maximum UV of 9 (Very High) and 9 hours of bright sunshine. There are 2-5 mm of rainfall expected with 39% chance of some rain and a gentle breeze of 9 mph from the west.

81
°F maximum temperature
61
°F minimum temperature
isolated thunderstorms
9
hours of sunshine
9
UV index (Very High)
39
% chance of some rain
<5
mm of rainfall expected
81
°F wind chill
9
mph wind from W

Keystone weather for Monday 29th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 75°F, maximum UV of 9 (Very High) and 13 hours of bright sunshine. There are 2-5 mm of rainfall expected with 17% chance of some rain and a moderate breeze of 17 mph from the south-west.

75
°F maximum temperature
57
°F minimum temperature
isolated thunderstorms
13
hours of sunshine
9
UV index (Very High)
17
% chance of some rain
<5
mm of rainfall expected
75
°F wind chill
17
mph wind from SW

Keystone weather for Tuesday 30th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 79°F, maximum UV of 9 (Very High) and 15 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a light breeze of 7 mph from the south-west.

79
°F maximum temperature
55
°F minimum temperature
isolated thunderstorms
15
hours of sunshine
9
UV index (Very High)
25
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
7
mph wind from SW

Keystone weather for Wednesday 1st July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 20% chance of some rain and a light breeze of 7 mph from the south-west.