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Hourly
7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Castlewood, SD
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May
Average Temperature
High
20°
Feels 19
Low
8°
Feels 5
Average Precipitation
11 Days
Rain amount
96.1mm
Snow amount
0.1cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
15°
23
22°
24
26°
25
30°
26
29°
27
28°
28
25°
29
24°
30
24°
31
25°
Forecast
Friday, May 22, 2026
Day
15°
Feels 14
Wind
34 km/h E
Gust
51 km/h
Humidity
72%
P.O.P
100%
Rain
~15 mm
Night
8°
Feels 5
Wind
23 km/h SE
Gust
35 km/h
Humidity
88%
P.O.P
60%
Historical Averages
May 22
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.