Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 34°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
8th Aug
34

17

12

7
Sunday
9th Aug
30

19

9

7
Monday
10th Aug
30

17

9

7
Tuesday
11th Aug
28

18

9

7
Wednesday
12th Aug
25

15

7

7

5-day weather forecast updated at 04:03 on Saturday 8th August 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 8th August 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 34°C, high levels of heat & humidity, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0-2 mm of rainfall expected with 24% chance of some rain and a light breeze of 9 kph from the south-west.

34
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
12
hours of sunshine
7
UV index (High)
24
% chance of some rain
<2
mm of rainfall expected
H
high heat & humidity
9
kph wind from SW

Keystone weather for Sunday 9th August 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the east.

30
°C maximum temperature
19
°C minimum temperature
scattered clouds
9
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from E

Keystone weather for Monday 10th August 2026

30
°C maximum temperature
17
°C minimum temperature
scattered clouds
9
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
M
moderate heat & humidity
12
kph wind from SE

Keystone weather for Tuesday 11th August 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 2-5 mm of rainfall expected with 33% chance of some rain and a light breeze of 11 kph from the east.

28
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
7
UV index (High)
33
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
11
kph wind from E

Keystone weather for Wednesday 12th August 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 5-10 mm of rainfall expected with 64% chance of some rain and a light breeze of 12 kph from the south-east.