S
M
T
W
T
F
S
30
98°
74°
31
98°
75°
1
97°
75°
2
96°
74°
3
95°
75°
4
94°
76°
5
94°
75°
6
95°
76°
7
96°
76°
8
97°
77°
9
97°
76°
10
94°
76°
11
96°
75°
12
96°
76°
13
95°
75°
14
96°
73°
15
93°
73°
16
92°
74°
17
92°
73°
18
93°
75°
19
92°
75°
20
95°
74°
21
94°
75°
22
93°
74°
23
95°
72°
24
96°
70°
25
94°
70°
26
89°
69°
27
Hist. Avg.
93°
74°
28
Hist. Avg.
92°
73°
29
Hist. Avg.
92°
73°
30
Hist. Avg.
92°
73°
1
Hist. Avg.
92°
73°
2
Hist. Avg.
92°
72°
3
Hist. Avg.
92°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in McAllen
McAllen's September 2026 forecast shows daily high temperatures ranging from 89° to 98°, with overnight lows between 69° and 77°. The average high for September is 95° with an average low of 74°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in McAllen. See also: October | November | December.
