Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 25°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
22nd Jul
25

16

6

4
Thursday
23rd Jul
24

18

4

8
Friday
24th Jul
33

18

12

9
Saturday
25th Jul
37

23

9

9
Sunday
26th Jul
36

25

10

9

5-day weather forecast updated at 04:03 on Wednesday 22nd July 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 22nd July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 25°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 5-10 mm of rainfall expected with 30% chance of some rain and a light breeze of 11 kph from the south-east.

25
°C maximum temperature
16
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
4
UV index (Moderate)
30
% chance of some rain
<10
mm of rainfall expected
25
°C wind chill
11
kph wind from SE

Keystone weather for Thursday 23rd July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 24°C, maximum UV of 8 (Very High) and 4 hours of bright sunshine. There are 5-10 mm of rainfall expected with 76% chance of some rain and little or no wind of 5 kph from the south-east.

24
°C maximum temperature
18
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
8
UV index (Very High)
76
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
5
kph wind from SE

Keystone weather for Friday 24th July 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 33°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the west.

33
°C maximum temperature
18
°C minimum temperature
scattered clouds
12
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
7
kph wind from W

Keystone weather for Saturday 25th July 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 37°C, high levels of heat & humidity, maximum UV of 9 (Very High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 9% chance of some rain and a light breeze of 11 kph from the west.

37
°C maximum temperature
23
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
9
UV index (Very High)
9
% chance of some rain
<2
mm of rainfall expected
H
high heat & humidity
11
kph wind from W

Keystone weather for Sunday 26th July 2026

Expect scattered clouds in Keystone, South Dakota with a maximum temperature of 36°C, high levels of heat & humidity, maximum UV of 9 (Very High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the north-west.