Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 19°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
20th Jun
19

11

3

4
Sunday
21st Jun
16

11

0

6
Monday
22nd Jun
17

11

5

3
Tuesday
23rd Jun
20

10

12

7
Wednesday
24th Jun
19

10

3

8

5-day weather forecast updated at 04:03 on Saturday 20th 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 Saturday 20th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 4 (Moderate) and 3 hours of bright sunshine. There are 2-5 mm of rainfall expected with 80% chance of some rain and a light breeze of 12 kph from the south-east.

19
°C maximum temperature
11
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
4
UV index (Moderate)
80
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
12
kph wind from SE

Keystone weather for Sunday 21st June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 16°C, maximum UV of 6 (High) and no hours of bright sunshine. There are 20-30 mm of rainfall expected with 93% chance of some rain and a light breeze of 12 kph from the north.

16
°C maximum temperature
11
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
6
UV index (High)
93
% chance of some rain
<30
mm of rainfall expected
16
°C wind chill
12
kph wind from N

Keystone weather for Monday 22nd June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 3 (Moderate) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 76% chance of some rain and a light breeze of 7 kph from the south-east.

17
°C maximum temperature
11
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
3
UV index (Moderate)
76
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
7
kph wind from SE

Keystone weather for Tuesday 23rd June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 2-5 mm of rainfall expected with 34% chance of some rain and a light breeze of 8 kph from the north-east.

20
°C maximum temperature
10
°C minimum temperature
isolated thunderstorms
12
hours of sunshine
7
UV index (High)
34
% chance of some rain
<5
mm of rainfall expected
20
°C wind chill
8
kph wind from NE

Keystone weather for Wednesday 24th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 8 (Very High) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 53% chance of some rain and a light breeze of 9 kph from the east.