S
M
T
W
T
F
S
30
100°
82°
31
100°
84°
1
100°
82°
2
101°
81°
3
93°
82°
4
100°
78°
5
99°
80°
6
99°
81°
7
100°
82°
8
100°
84°
9
100°
83°
10
99°
80°
11
99°
82°
12
100°
78°
13
99°
82°
14
99°
80°
15
101°
80°
16
98°
79°
17
99°
79°
18
98°
78°
19
96°
75°
20
95°
75°
21
90°
70°
22
87°
66°
23
89°
68°
24
87°
69°
25
90°
70°
26
89°
69°
27
88°
69°
28
85°
69°
29
86°
68°
30
87°
69°
1
87°
69°
2
86°
68°
3
86°
68°
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 85° to 101°, with overnight lows between 66° and 80°. The average high for September is 91° with an average low of 72°. 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.
