Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 15°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Friday
22nd May
15

5

9

UV7
Saturday
23rd May
19

5

9

UV6
Sunday
24th May
26

9

12

UV7
Monday
25th May
30

14

13

UV8
Tuesday
26th May
28

17

11

UV7

5-day weather forecast updated at 04:02 on Friday 22nd 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 Friday 22nd May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 15°C, maximum UV of 7 (High) and 9 hours of bright sunshine. There are 2-5 mm of rainfall expected with 10% chance of some rain and a moderate breeze of 22 kph from the north-west.

15
°C maximum temperature
5
°C minimum temperature
sunshine and showers
9
hours of sunshine
UV7
UV index (High)
10
% chance of some rain
<5
mm of rainfall expected
15
°C wind chill
22
kph wind from NW

Keystone weather for Saturday 23rd May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 19°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 48% chance of some rain and a light breeze of 7 kph from the west.

19
°C maximum temperature
5
°C minimum temperature
sunshine and showers
9
hours of sunshine
UV6
UV index (High)
48
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
7
kph wind from W

Keystone weather for Sunday 24th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the west.

26
°C maximum temperature
9
°C minimum temperature
scattered clouds
12
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
26
°C wind chill
8
kph wind from W

Keystone weather for Monday 25th May 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 30°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south.

30
°C maximum temperature
14
°C minimum temperature
scattered clouds
13
hours of sunshine
UV8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
10
kph wind from S

Keystone weather for Tuesday 26th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 50% chance of some rain and a moderate breeze of 23 kph from the south.