S
M
T
W
T
F
S
26
88°
72°
27
88°
73°
28
88°
75°
29
88°
74°
30
88°
74°
1
88°
75°
2
90°
73°
3
88°
72°
4
90°
73°
5
90°
75°
6
88°
75°
7
88°
73°
8
89°
72°
9
90°
72°
10
90°
74°
11
90°
77°
12
90°
75°
13
88°
76°
14
88°
77°
15
90°
76°
16
90°
74°
17
90°
77°
18
88°
74°
19
90°
75°
20
90°
77°
21
90°
75°
22
90°
75°
23
86°
75°
24
90°
77°
25
90°
77°
26
91°
76°
27
90°
75°
28
88°
75°
29
90°
76°
30
91°
77°
31
90°
77°
1
90°
78°
2
88°
76°
3
88°
74°
4
89°
75°
5
89°
78°
6
90°
78°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Guayanilla
Guayanilla's May 2026 forecast shows daily high temperatures ranging from 88° to 91°, with overnight lows between 74° and 78°. The average high for May is 89° with an average low of 77°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Guayanilla. See also: June | July | August.
