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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Keystone, SD
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May
Average Temperature
High
17°
Feels 16
Low
5°
Feels 3
Average Precipitation
18 Days
Rain amount
115.1mm
Snow amount
7.5cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
18°
4
13°
5
6°
6
9°
7
14°
8
18°
9
18°
10
18°
11
21°
12
24°
13
23°
14
20°
15
20°
16
20°
17
20°
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Forecast
Sunday, May 3, 2026
Day
18°
Feels 18
Wind
13 km/h NW
Gust
20 km/h
Humidity
42%
P.O.P
60%
Rain
1-3 mm
Night
8°
Feels 5
Wind
19 km/h W
Gust
29 km/h
Humidity
62%
P.O.P
20%
Historical Averages
May 3
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.