Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 20°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Thursday
18th Jun
20

10

8

8
Friday
19th Jun
22

11

6

9
Saturday
20th Jun
20

11

1

2
Sunday
21st Jun
16

11

0

2
Monday
22nd Jun
18

10

4

9

5-day weather forecast updated at 04:03 on Thursday 18th 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 18th June 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the north-west.

20
°C maximum temperature
10
°C minimum temperature
broken clouds
8
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
0
no heat & humidity
9
kph wind from NW

Keystone weather for Friday 19th June 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 22°C, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the east.

22
°C maximum temperature
11
°C minimum temperature
broken clouds
6
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
22
°C wind chill
10
kph wind from E

Keystone weather for Saturday 20th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 83% chance of some rain and a light breeze of 12 kph from the east.

20
°C maximum temperature
11
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
2
UV index (Low)
83
% chance of some rain
<20
mm of rainfall expected
20
°C wind chill
12
kph wind from E

Keystone weather for Sunday 21st June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 16°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 10-20 mm of rainfall expected with 94% chance of some rain and a light breeze of 9 kph from the north-east.

16
°C maximum temperature
11
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
2
UV index (Low)
94
% chance of some rain
<20
mm of rainfall expected
16
°C wind chill
9
kph wind from NE

Keystone weather for Monday 22nd June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 18°C, maximum UV of 9 (Very High) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 69% chance of some rain and a light breeze of 8 kph from the north-east.