S
M
T
W
T
F
S
30
95°
76°
31
95°
75°
1
92°
75°
2
90°
74°
3
91°
75°
4
91°
73°
5
92°
72°
6
92°
74°
7
93°
74°
8
94°
73°
9
94°
75°
10
93°
75°
11
91°
70°
12
91°
72°
13
94°
70°
14
93°
64°
15
91°
68°
16
90°
71°
17
92°
71°
18
93°
70°
19
92°
71°
20
92°
70°
21
84°
67°
22
86°
62°
23
82°
62°
24
80°
60°
25
80°
61°
26
82°
65°
27
90°
66°
28
90°
62°
29
87°
67°
30
90°
68°
1
90°
57°
2
89°
55°
3
79°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Addison
Addison's September 2026 forecast shows daily high temperatures ranging from 79° to 95°, with overnight lows between 54° and 76°. The average high for September is 90° with an average low of 68°. 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 Addison. See also: October | November | December.
