Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 16°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
20th May
16

3

9

UV7
Thursday
21st May
16

6

6

UV5
Friday
22nd May
12

7

0

UV1
Saturday
23rd May
19

6

7

UV7
Sunday
24th May
25

10

10

UV7

5-day weather forecast updated at 04:02 on Wednesday 20th May 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 Wednesday 20th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 16°C, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 55% chance of some rain and a gentle breeze of 15 kph from the south.

16
°C maximum temperature
3
°C minimum temperature
sunshine and showers
9
hours of sunshine
UV7
UV index (High)
55
% chance of some rain
<2
mm of rainfall expected
16
°C wind chill
15
kph wind from S

Keystone weather for Thursday 21st May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 16°C, maximum UV of 5 (Moderate) and 6 hours of bright sunshine. There are 10-20 mm of rainfall expected with 83% chance of some rain and a gentle breeze of 13 kph from the south-east.

16
°C maximum temperature
6
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
UV5
UV index (Moderate)
83
% chance of some rain
<20
mm of rainfall expected
0
no heat & humidity
13
kph wind from SE

Keystone weather for Friday 22nd May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 12°C, maximum UV of 1 (Low) and no hours of bright sunshine. There are 5-10 mm of rainfall expected with 54% chance of some rain and a light breeze of 11 kph from the north.

12
°C maximum temperature
7
°C minimum temperature
isolated thunderstorms
0
hours of sunshine
UV1
UV index (Low)
54
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
11
kph wind from N

Keystone weather for Saturday 23rd May 2026

Expect broken clouds in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and little or no wind of 6 kph from the west.

19
°C maximum temperature
6
°C minimum temperature
broken clouds
7
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
6
kph wind from W

Keystone weather for Sunday 24th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 17% chance of some rain and a light breeze of 7 kph from the west.