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
100°
79°
7
101°
80°
8
101°
80°
9
100°
79°
10
101°
81°
11
101°
78°
12
100°
78°
13
99°
75°
14
94°
77°
15
93°
73°
16
94°
74°
17
95°
76°
18
95°
74°
19
85°
66°
20
89°
71°
21
91°
72°
22
91°
72°
23
90°
71°
24
88°
70°
25
81°
70°
26
86°
69°
27
86°
69°
28
88°
68°
29
86°
69°
30
83°
61°
1
77°
57°
2
76°
58°
3
76°
57°
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 76° to 101°, with overnight lows between 57° and 81°. 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 Plano. See also: October | November | December.
