S
M
T
W
T
F
S
26
99°
77°
27
97°
77°
28
97°
78°
29
99°
79°
30
100°
79°
31
100°
78°
1
99°
80°
2
99°
80°
3
100°
78°
4
101°
79°
5
101°
79°
6
98°
78°
7
100°
79°
8
100°
79°
9
101°
78°
10
100°
79°
11
101°
78°
12
100°
77°
13
101°
78°
14
101°
79°
15
100°
79°
16
100°
78°
17
101°
77°
18
100°
79°
19
101°
79°
20
100°
77°
21
98°
78°
22
98°
78°
23
97°
77°
24
98°
78°
25
97°
78°
26
98°
77°
27
99°
78°
28
99°
78°
29
97°
76°
30
98°
77°
31
98°
77°
1
97°
76°
2
98°
76°
3
97°
74°
4
94°
73°
5
94°
74°
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 94° to 101°, with overnight lows between 73° and 80°. The average high for August is 99° with an average low of 78°. 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.
