S
M
T
W
T
F
S
26
103°
78°
27
103°
79°
28
103°
81°
29
103°
82°
30
103°
82°
31
103°
83°
1
107°
83°
2
107°
74°
3
101°
77°
4
101°
83°
5
102°
84°
6
102°
82°
7
102°
80°
8
101°
80°
9
101°
79°
10
100°
80°
11
103°
81°
12
104°
81°
13
101°
82°
14
99°
81°
15
102°
79°
16
100°
78°
17
102°
79°
18
101°
80°
19
100°
79°
20
101°
78°
21
101°
78°
22
100°
79°
23
102°
78°
24
99°
79°
25
100°
79°
26
99°
78°
27
98°
79°
28
99°
79°
29
99°
78°
30
98°
78°
31
99°
78°
1
98°
78°
2
98°
77°
3
97°
78°
4
97°
78°
5
96°
77°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in McAllen
McAllen's August 2026 forecast shows daily high temperatures ranging from 96° to 104°, with overnight lows between 77° and 82°. The average high for August is 100° with an average low of 79°. 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 McAllen. See also: September | October | November.
