Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 32°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
29th Jul
32

20

8

8
Thursday
30th Jul
28

20

8

8
Friday
31st Jul
29

17

9

8
Saturday
1st Aug
33

19

13

9
Sunday
2nd Aug
37

23

10

9

5-day weather forecast updated at 04:03 on Wednesday 29th July 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 29th July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 32°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 69% chance of some rain and a gentle breeze of 13 kph from the south-east.

32
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
8
hours of sunshine
8
UV index (Very High)
69
% chance of some rain
<10
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from SE

Keystone weather for Thursday 30th July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 72% chance of some rain and a light breeze of 11 kph from the north.

28
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
8
hours of sunshine
8
UV index (Very High)
72
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
11
kph wind from N

Keystone weather for Friday 31st July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 2-5 mm of rainfall expected with 35% chance of some rain and a light breeze of 8 kph from the south-east.

29
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
8
UV index (Very High)
35
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
8
kph wind from SE

Keystone weather for Saturday 1st August 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 33°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south-east.

33
°C maximum temperature
19
°C minimum temperature
clear skies
13
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
12
kph wind from SE

Keystone weather for Sunday 2nd August 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 37°C, high levels of heat & humidity, maximum UV of 9 (Very High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south-west.