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
64°
56°
23
68°
51°
24
69°
53°
25
70°
48°
26
70°
53°
27
67°
49°
28
72°
51°
29
74°
54°
30
70°
53°
1
72°
54°
2
68°
45°
3
66°
51°
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 64° to 74°, with overnight lows between 45° and 56°. The average high for September is 69° with an average low of 52°. 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.
