S
M
T
W
T
F
S
30
69°
36°
31
70°
33°
1
71°
35°
2
72°
37°
3
74°
38°
4
74°
33°
5
71°
33°
6
72°
34°
7
68°
30°
8
66°
31°
9
65°
29°
10
64°
32°
11
68°
32°
12
69°
30°
13
70°
34°
14
70°
35°
15
71°
34°
16
70°
27°
17
64°
25°
18
61°
24°
19
60°
25°
20
61°
27°
21
63°
32°
22
68°
34°
23
68°
31°
24
64°
32°
25
66°
31°
26
59°
26°
27
59°
24°
28
58°
26°
29
56°
28°
30
61°
28°
1
Hist. Avg.
55°
27°
2
Hist. Avg.
55°
27°
3
Hist. Avg.
54°
26°
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 56° to 74°, with overnight lows between 24° and 38°. The average high for September is 66° with an average low of 31°. 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.
