S
M
T
W
T
F
S
30
78°
56°
31
70°
64°
1
86°
66°
2
82°
66°
3
84°
65°
4
79°
61°
5
75°
54°
6
71°
46°
7
72°
49°
8
78°
57°
9
83°
64°
10
77°
51°
11
68°
45°
12
76°
50°
13
80°
56°
14
75°
49°
15
78°
53°
16
75°
51°
17
74°
51°
18
73°
47°
19
74°
45°
20
76°
51°
21
74°
51°
22
67°
51°
23
69°
50°
24
70°
50°
25
73°
49°
26
74°
47°
27
69°
43°
28
73°
49°
29
74°
50°
30
75°
50°
1
74°
49°
2
72°
47°
3
71°
44°
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 67° to 83°, with overnight lows between 43° and 64°. The average high for September is 74° with an average low of 50°. 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.
