S
M
T
W
T
F
S
26
94°
78°
27
94°
78°
28
97°
76°
29
99°
77°
30
99°
78°
31
98°
78°
1
99°
77°
2
99°
78°
3
98°
78°
4
100°
77°
5
100°
78°
6
99°
78°
7
99°
77°
8
100°
78°
9
99°
78°
10
99°
76°
11
99°
77°
12
97°
76°
13
96°
75°
14
97°
74°
15
96°
75°
16
96°
75°
17
97°
76°
18
97°
75°
19
98°
74°
20
97°
73°
21
95°
73°
22
95°
74°
23
96°
73°
24
95°
75°
25
96°
75°
26
95°
74°
27
94°
73°
28
95°
73°
29
95°
74°
30
96°
73°
31
96°
73°
1
95°
74°
2
94°
73°
3
93°
74°
4
94°
75°
5
92°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Harlingen
Harlingen's August 2026 forecast shows daily high temperatures ranging from 92° to 100°, with overnight lows between 73° and 78°. The average high for August is 97° with an average low of 75°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Harlingen. See also: September | October | November.
