S
M
T
W
T
F
S
30
84°
66°
31
88°
70°
1
93°
73°
2
93°
70°
3
91°
72°
4
91°
70°
5
85°
69°
6
82°
60°
7
82°
56°
8
85°
60°
9
81°
65°
10
77°
57°
11
81°
52°
12
87°
59°
13
73°
47°
14
71°
44°
15
83°
62°
16
75°
63°
17
84°
65°
18
72°
61°
19
69°
63°
20
69°
61°
21
68°
60°
22
62°
56°
23
69°
55°
24
71°
51°
25
67°
51°
26
71°
47°
27
73°
46°
28
75°
43°
29
80°
46°
30
66°
59°
1
71°
61°
2
67°
43°
3
68°
44°
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 67° to 68°, with overnight lows between 43° and 44°. The average high for September is 68° with an average low of 44°. 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.
