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.

Friday
26th Jun
26

12

10

8
Saturday
27th Jun
29

18

11

8
Sunday
28th Jun
28

15

11

9
Monday
29th Jun
25

14

13

9
Tuesday
30th Jun
27

12

14

9

5-day weather forecast updated at 04:03 on Friday 26th 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 Friday 26th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 8 (Very High) and 10 hours of bright sunshine. There are 2-5 mm of rainfall expected with 49% chance of some rain and a gentle breeze of 14 kph from the south.

26
°C maximum temperature
12
°C minimum temperature
isolated thunderstorms
10
hours of sunshine
8
UV index (Very High)
49
% chance of some rain
<5
mm of rainfall expected
26
°C wind chill
14
kph wind from S

Keystone weather for Saturday 27th June 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 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 30% chance of some rain and a gentle breeze of 16 kph from the south-west.

29
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
11
hours of sunshine
8
UV index (Very High)
30
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
16
kph wind from SW

Keystone weather for Sunday 28th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 9 (Very High) and 11 hours of bright sunshine. There are 2-5 mm of rainfall expected with 34% chance of some rain and a gentle breeze of 13 kph from the south.

28
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
11
hours of sunshine
9
UV index (Very High)
34
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
13
kph wind from S

Keystone weather for Monday 29th June 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 9 (Very High) and 13 hours of bright sunshine. There are 2-5 mm of rainfall expected with 15% chance of some rain and a moderate breeze of 22 kph from the west.

25
°C maximum temperature
14
°C minimum temperature
sunshine and showers
13
hours of sunshine
9
UV index (Very High)
15
% chance of some rain
<5
mm of rainfall expected
25
°C wind chill
22
kph wind from W

Keystone weather for Tuesday 30th June 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 27°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 gentle breeze of 13 kph from the south-west.