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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Rock Valley, IA
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May
Average Temperature
High
22°
Feels 22
Low
10°
Feels 8
Average Precipitation
11 Days
Rain amount
83.2mm
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
16°
19
15°
20
17°
21
18°
22
17°
23
20°
24
25°
25
27°
26
25°
27
24°
28
25°
29
26°
30
25°
31
25°
Forecast
Monday, May 18, 2026
Day
16°
Feels 15
Wind
21 km/h N
Gust
32 km/h
Humidity
82%
P.O.P
90%
Rain
~5 mm
Night
7°
Feels 3
Wind
33 km/h NW
Gust
50 km/h
Humidity
88%
P.O.P
90%
Rain
<1 mm
Historical Averages
May 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.