Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 17°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
19th Sep
17

12

1

2
Sunday
20th Sep
13

10

2

1
Monday
21st Sep
15

10

1

3
Tuesday
22nd Sep
20

10

6

3
Wednesday
23rd Sep
23

13

7

5

5-day weather forecast updated at 04:03 on Saturday 19th September 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 19th September 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 17°C, maximum UV of 2 (Low) and 1 hour of bright sunshine. There are 10-20 mm of rainfall expected with 87% chance of some rain and a light breeze of 8 kph from the east.

17
°C maximum temperature
12
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
2
UV index (Low)
87
% chance of some rain
<20
mm of rainfall expected
17
°C wind chill
8
kph wind from E

Keystone weather for Sunday 20th September 2026

Expect mostly cloudy with rain in Keystone, South Dakota with a maximum temperature of 13°C, maximum UV of 1 (Low) and 2 hours of bright sunshine. There are 20-30 mm of rainfall expected with 100% chance of some rain and a light breeze of 8 kph from the east.

13
°C maximum temperature
10
°C minimum temperature
mostly cloudy with rain
2
hours of sunshine
1
UV index (Low)
100
% chance of some rain
<30
mm of rainfall expected
0
no heat & humidity
8
kph wind from E

Keystone weather for Monday 21st September 2026

Expect mostly cloudy with rain in Keystone, South Dakota with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 55% chance of some rain and a light breeze of 9 kph from the south-east.

15
°C maximum temperature
10
°C minimum temperature
mostly cloudy with rain
1
hour of sunshine
3
UV index (Moderate)
55
% chance of some rain
<10
mm of rainfall expected
15
°C wind chill
9
kph wind from SE

Keystone weather for Tuesday 22nd September 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 20°C, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 14 kph from the south.

20
°C maximum temperature
10
°C minimum temperature
broken clouds
6
hours of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
20
°C wind chill
14
kph wind from S

Keystone weather for Wednesday 23rd September 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 5 (Moderate) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 32% chance of some rain and a light breeze of 9 kph from the south-west.