S
M
T
W
T
F
S
26
88°
76°
27
94°
76°
28
94°
76°
29
94°
73°
30
92°
75°
1
91°
60°
2
74°
59°
3
81°
64°
4
83°
72°
5
90°
77°
6
95°
75°
7
85°
72°
8
78°
72°
9
87°
73°
10
91°
72°
11
92°
71°
12
92°
72°
13
91°
70°
14
86°
73°
15
93°
74°
16
93°
74°
17
94°
75°
18
93°
74°
19
93°
75°
20
92°
74°
21
88°
75°
22
92°
75°
23
93°
74°
24
94°
75°
25
90°
75°
26
93°
73°
27
90°
74°
28
92°
75°
29
93°
75°
30
94°
74°
31
91°
74°
1
91°
74°
2
93°
73°
3
95°
76°
4
96°
76°
5
95°
75°
6
93°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Harlingen
Harlingen's May 2026 forecast shows daily high temperatures ranging from 74° to 96°, with overnight lows between 59° and 77°. The average high for May is 90° with an average low of 73°. 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 Harlingen. See also: June | July | August.
