Keystone weather live forecast

Today's maximum temperature in Keystone is expected to be 18°C. Select a day from the live weather forecast for Keystone, South Dakota, USA for more weather parameters.

Wednesday
24th Jun
18

10

5

4
Thursday
25th Jun
14

11

1

3
Friday
26th Jun
24

13

5

9
Saturday
27th Jun
29

17

12

8
Sunday
28th Jun
26

15

12

9

5-day weather forecast updated at 04:03 on Wednesday 24th June 2026 GMT

More about Keystone

Keystone by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for South Dakota

GO Airport Shuttle discount code: 5% off airport transfers

Discount Code

Save EXTRA 5% on airport transfers worldwide
Book private taxis & shuttle buses with discount code
Enter in coupon box on 'Reservations' page

Show discount code

******WEB

Redeem GO Airport Shuttle discount code >>

Expires at 23:59 on Thursday 31st Dec 2026

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 24th June 2026

Expect mostly cloudy with light rain in Keystone, South Dakota with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 56% chance of some rain and a light breeze of 9 kph from the east.

18
°C maximum temperature
10
°C minimum temperature
mostly cloudy with light rain
5
hours of sunshine
4
UV index (Moderate)
56
% chance of some rain
<2
mm of rainfall expected
18
°C wind chill
9
kph wind from E

Keystone weather for Thursday 25th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 14°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 5-10 mm of rainfall expected with 97% chance of some rain and a light breeze of 12 kph from the south-east.

14
°C maximum temperature
11
°C minimum temperature
isolated thunderstorms
1
hour of sunshine
3
UV index (Moderate)
97
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
12
kph wind from SE

Keystone weather for Friday 26th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 24°C, maximum UV of 9 (Very High) and 5 hours of bright sunshine. There are 2-5 mm of rainfall expected with 46% chance of some rain and a light breeze of 12 kph from the south-east.

24
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
9
UV index (Very High)
46
% chance of some rain
<5
mm of rainfall expected
0
no heat & humidity
12
kph wind from SE

Keystone weather for Saturday 27th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 0-2 mm of rainfall expected with 29% chance of some rain and a gentle breeze of 14 kph from the south-west.

29
°C maximum temperature
17
°C minimum temperature
isolated thunderstorms
12
hours of sunshine
8
UV index (Very High)
29
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
14
kph wind from SW

Keystone weather for Sunday 28th June 2026

Expect isolated thunderstorms in Keystone, South Dakota with a maximum temperature of 26°C, maximum UV of 9 (Very High) and 12 hours of bright sunshine. There are 2-5 mm of rainfall expected with 25% chance of some rain and a gentle breeze of 15 kph from the south-west.