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
14th Aug
26

15

6

7
Saturday
15th Aug
21

14

4

5
Sunday
16th Aug
23

13

4

5
Monday
17th Aug
27

15

10

7
Tuesday
18th Aug
26

15

7

5

5-day weather forecast updated at 04:03 on Friday 14th 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 Friday 14th August 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 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 40% chance of some rain and a light breeze of 9 kph from the south.

26
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
7
UV index (High)
40
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
9
kph wind from S

Keystone weather for Saturday 15th August 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 21°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 89% chance of some rain and little or no wind of 6 kph from the north-east.

21
°C maximum temperature
14
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
5
UV index (Moderate)
89
% chance of some rain
<10
mm of rainfall expected
21
°C wind chill
6
kph wind from NE

Keystone weather for Sunday 16th August 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 68% chance of some rain and a light breeze of 10 kph from the south.

23
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
5
UV index (Moderate)
68
% chance of some rain
<5
mm of rainfall expected
23
°C wind chill
10
kph wind from S

Keystone weather for Monday 17th August 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 2-5 mm of rainfall expected with 45% chance of some rain and little or no wind of 6 kph from the west.

27
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
10
hours of sunshine
7
UV index (High)
45
% chance of some rain
<5
mm of rainfall expected
L
low heat & humidity
6
kph wind from W

Keystone weather for Tuesday 18th August 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 50% chance of some rain and little or no wind of 6 kph from the west.