Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 73°F. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Saturday
16th May
73

46

8

8
Sunday
17th May
61

45

4

7
Monday
18th May
43

34

0

2
Tuesday
19th May
48

34

9

6
Wednesday
20th May
59

34

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 73°F, 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 9 mph from the south-east.

73
°F maximum temperature
46
°F 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
9
mph wind from SE

Keystone weather for Sunday 17th May 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 61°F, 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 10 mph from the north.

61
°F maximum temperature
45
°F minimum temperature
isolated thunderstorms
4
hours of sunshine
7
UV index (High)
54
% chance of some rain
<5
mm of rainfall expected
61
°F wind chill
10
mph 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 43°F, 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 14 mph from the north.

43
°F maximum temperature
34
°F 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
36
°F wind chill
14
mph wind from N

Keystone weather for Tuesday 19th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 48°F, 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 4 mph from the north-west.

48
°F maximum temperature
34
°F minimum temperature
sunshine and showers
9
hours of sunshine
6
UV index (High)
25
% chance of some rain
<2
mm of rainfall expected
46
°F wind chill
4
mph wind from NW

Keystone weather for Wednesday 20th May 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 59°F, 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 8 mph from the south.