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
88°
76°
4
83°
73°
5
82°
70°
6
88°
68°
7
90°
68°
8
86°
68°
9
84°
68°
10
83°
67°
11
88°
70°
12
90°
69°
13
89°
66°
14
87°
67°
15
86°
65°
16
87°
70°
17
85°
68°
18
86°
66°
19
83°
65°
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 80° to 90°, with overnight lows between 63° and 76°. The average high for October is 85° 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.
