S
M
T
W
T
F
S
30
95°
75°
31
94°
74°
1
92°
74°
2
89°
73°
3
90°
73°
4
91°
71°
5
91°
71°
6
92°
73°
7
93°
73°
8
93°
72°
9
92°
73°
10
92°
73°
11
90°
69°
12
90°
71°
13
92°
69°
14
93°
63°
15
91°
67°
16
90°
70°
17
91°
70°
18
92°
69°
19
91°
69°
20
91°
68°
21
83°
65°
22
85°
61°
23
81°
61°
24
79°
59°
25
79°
60°
26
80°
64°
27
89°
65°
28
89°
61°
29
86°
66°
30
89°
67°
1
89°
55°
2
88°
54°
3
78°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Frisco
Frisco's September 2026 forecast shows daily high temperatures ranging from 78° to 95°, with overnight lows between 52° and 75°. The average high for September is 89° with an average low of 67°. 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 Frisco. See also: October | November | December.
