S
M
T
W
T
F
S
30
74°
57°
31
74°
57°
1
75°
59°
2
76°
61°
3
76°
62°
4
82°
61°
5
82°
62°
6
80°
61°
7
78°
60°
8
74°
59°
9
75°
59°
10
73°
60°
11
75°
59°
12
77°
58°
13
79°
58°
14
78°
57°
15
79°
58°
16
79°
58°
17
78°
57°
18
77°
57°
19
75°
56°
20
76°
57°
21
80°
53°
22
79°
52°
23
79°
43°
24
71°
42°
25
73°
50°
26
76°
47°
27
72°
53°
28
76°
55°
29
79°
55°
30
77°
48°
1
78°
44°
2
67°
51°
3
66°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Plano
Plano's September 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 42° and 62°. The average high for September is 76° with an average low of 55°. 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 Plano. See also: October | November | December.
