Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 15°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
25th Jun
15

11

0

4
Friday
26th Jun
25

12

9

8
Saturday
27th Jun
29

17

12

8
Sunday
28th Jun
26

15

14

10
Monday
29th Jun
25

13

10

9

5-day weather forecast updated at 04:03 on Thursday 25th 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 Thursday 25th June 2026

Expect mostly cloudy with rain in Keystone, South Dakota with a maximum temperature of 15°C, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 67% chance of some rain and a gentle breeze of 13 kph from the south-east.

15
°C maximum temperature
11
°C minimum temperature
mostly cloudy with rain
0
hours of sunshine
4
UV index (Moderate)
67
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
13
kph wind from SE

Keystone weather for Friday 26th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 8 (Very High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 37% chance of some rain and a gentle breeze of 14 kph from the south.

25
°C maximum temperature
12
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
8
UV index (Very High)
37
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
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 12 hours of bright sunshine. There are 2-5 mm of rainfall expected with 42% chance of some rain and a gentle breeze of 13 kph from the south-west.

29
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
12
hours of sunshine
8
UV index (Very High)
42
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
13
kph wind from SW

Keystone weather for Sunday 28th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 10 (Very High) and 14 hours of bright sunshine. There are 2-5 mm of rainfall expected with 30% chance of some rain and a gentle breeze of 17 kph from the west.

26
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
14
hours of sunshine
10
UV index (Very High)
30
% chance of some rain
<5
mm of rainfall expected
26
°C wind chill
17
kph wind from W

Keystone weather for Monday 29th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 9 (Very High) and 10 hours of bright sunshine. There are 2-5 mm of rainfall expected with 24% chance of some rain and a moderate breeze of 20 kph from the south-west.