Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 23°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
16th May
23

8

8

8
Sunday
17th May
16

7

4

7
Monday
18th May
6

1

0

2
Tuesday
19th May
9

1

9

6
Wednesday
20th May
15

1

7

7

5-day weather forecast updated at 04:02 on Saturday 16th 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 Saturday 16th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 23°C, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 5-10 mm of rainfall expected with 82% chance of some rain and a gentle breeze of 15 kph from the south-east.

23
°C maximum temperature
8
°C minimum temperature
isolated thunderstorms
8
hours of sunshine
8
UV index (Very High)
82
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
15
kph wind from SE

Keystone weather for Sunday 17th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 16°C, maximum UV of 7 (High) and 4 hours of bright sunshine. There are 2-5 mm of rainfall expected with 54% chance of some rain and a gentle breeze of 16 kph from the north.

16
°C maximum temperature
7
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
7
UV index (High)
54
% chance of some rain
<5
mm of rainfall expected
16
°C wind chill
16
kph wind from N

Keystone weather for Monday 18th May 2026

Expect cloudy with sleet or snow in Keystone, South Dakota with a maximum temperature of 6°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 10-20 mm of sleet/snow expected with 85% chance of some sleet or snow and a moderate breeze of 22 kph from the north.

6
°C maximum temperature
1
°C minimum temperature
cloudy with sleet or snow
0
hours of sunshine
2
UV index (Low)
85
% chance of some sleet or snow
<20
mm of sleet/snow expected
2
°C wind chill
22
kph wind from N

Keystone weather for Tuesday 19th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 9°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a light breeze of 7 kph from the north-west.

9
°C maximum temperature
1
°C minimum temperature
sunshine and showers
9
hours of sunshine
6
UV index (High)
25
% chance of some rain
<2
mm of rainfall expected
8
°C wind chill
7
kph wind from NW

Keystone weather for Wednesday 20th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 15°C, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 48% chance of some rain and a gentle breeze of 13 kph from the south.