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.

Friday
4th Sep
32

18

11

8
Saturday
5th Sep
33

21

7

7
Sunday
6th Sep
30

20

4

8
Monday
7th Sep
28

20

11

8
Tuesday
8th Sep
27

16

12

8

5-day weather forecast updated at 04:03 on Friday 4th September 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 Friday 4th September 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 32°C, 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 13 kph from the south.

32
°C maximum temperature
18
°C minimum temperature
scattered clouds
11
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from S

Keystone weather for Saturday 5th September 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 33°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the west.

33
°C maximum temperature
21
°C minimum temperature
scattered clouds
7
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
M
moderate heat & humidity
10
kph wind from W

Keystone weather for Sunday 6th September 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 49% chance of some rain and a light breeze of 8 kph from the east.

30
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
8
UV index (Very High)
49
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
8
kph wind from E

Keystone weather for Monday 7th September 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 11 hours of bright sunshine. There are 2-5 mm of rainfall expected with 19% chance of some rain and a gentle breeze of 17 kph from the south-west.

28
°C maximum temperature
20
°C minimum temperature
isolated thunderstorms
11
hours of sunshine
8
UV index (Very High)
19
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
17
kph wind from SW

Keystone weather for Tuesday 8th September 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 27°C, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the west.