S
M
T
W
T
F
S
27
99°
72°
28
97°
73°
29
96°
77°
30
100°
80°
1
100°
76°
2
95°
75°
3
93°
76°
4
80°
75°
5
83°
75°
6
93°
72°
7
88°
73°
8
89°
69°
9
89°
70°
10
92°
70°
11
90°
71°
12
93°
72°
13
95°
74°
14
93°
72°
15
89°
70°
16
85°
65°
17
80°
62°
18
79°
59°
19
77°
54°
20
82°
68°
21
80°
68°
22
82°
64°
23
82°
63°
24
83°
63°
25
83°
64°
26
84°
65°
27
84°
67°
28
85°
67°
29
86°
66°
30
87°
67°
31
87°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Harlingen
Harlingen's October 2026 forecast shows daily high temperatures ranging from 77° to 95°, with overnight lows between 54° and 74°. The average high for October is 86° with an average low of 67°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Harlingen. See also: November | December | January.
