Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 26°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
9th Jul
26

16

8

7
Friday
10th Jul
29

17

14

9
Saturday
11th Jul
33

19

13

10
Sunday
12th Jul
36

22

15

11
Monday
13th Jul
36

23

15

10

5-day weather forecast updated at 04:03 on Thursday 9th 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 Thursday 9th July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 26°C, low levels of heat & humidity, maximum UV of 7 (High) and 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 79% chance of some rain and a light breeze of 8 kph from the south-west.

26
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
8
hours of sunshine
7
UV index (High)
79
% chance of some rain
<10
mm of rainfall expected
L
low heat & humidity
8
kph wind from SW

Keystone weather for Friday 10th July 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

29
°C maximum temperature
17
°C minimum temperature
clear skies
14
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
11
kph wind from SE

Keystone weather for Saturday 11th July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 33°C, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 13 hours of bright sunshine. There are 0-2 mm of rainfall expected with 17% chance of some rain and a gentle breeze of 13 kph from the south.

33
°C maximum temperature
19
°C minimum temperature
isolated thunderstorms
13
hours of sunshine
10
UV index (Very High)
17
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from S

Keystone weather for Sunday 12th July 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 36°C, high levels of heat & humidity, maximum UV of 11 (Extreme) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 15 kph from the south.

36
°C maximum temperature
22
°C minimum temperature
clear skies
15
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
H
high heat & humidity
15
kph wind from S

Keystone weather for Monday 13th July 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 36°C, high levels of heat & humidity, maximum UV of 10 (Very High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the south.