Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 28°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Friday
9th Oct
28

12

11

4
Saturday
10th Oct
27

15

8

4
Sunday
11th Oct
15

7

0

3
Monday
12th Oct
12

5

0

5
Tuesday
13th Oct
13

5

0

3

5-day weather forecast updated at 04:02 on Friday 9th October 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 9th October 2026

Expect clear skies in Keystone, South Dakota with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the south-west.

28
°C maximum temperature
12
°C minimum temperature
clear skies
11
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
L
low heat & humidity
17
kph wind from SW

Keystone weather for Saturday 10th October 2026

Expect sunshine and showers in Keystone, South Dakota with a maximum temperature of 27°C, low levels of heat & humidity, maximum UV of 4 (Moderate) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 19 kph from the west.

27
°C maximum temperature
15
°C minimum temperature
sunshine and showers
8
hours of sunshine
4
UV index (Moderate)
25
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
19
kph wind from W

Keystone weather for Sunday 11th October 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 15°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 32% chance of some rain and a light breeze of 10 kph from the north-east.

15
°C maximum temperature
7
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
3
UV index (Moderate)
32
% chance of some rain
<2
mm of rainfall expected
15
°C wind chill
10
kph wind from NE

Keystone weather for Monday 12th October 2026

Expect overcast with light rain in Keystone, South Dakota with a maximum temperature of 12°C, maximum UV of 5 (Moderate) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 35% chance of some rain and little or no wind of 6 kph from the north-east.

12
°C maximum temperature
5
°C minimum temperature
overcast with light rain
0
hours of sunshine
5
UV index (Moderate)
35
% chance of some rain
<5
mm of rainfall expected
12
°C wind chill
6
kph wind from NE

Keystone weather for Tuesday 13th October 2026

Expect overcast with light rain in Keystone, South Dakota with a maximum temperature of 13°C, maximum UV of 3 (Moderate) and no hours of bright sunshine. There are 0-2 mm of rainfall expected with 42% chance of some rain and a light breeze of 9 kph from the south-east.