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
99°
81°
7
100°
82°
8
100°
84°
9
100°
83°
10
99°
80°
11
100°
77°
12
102°
79°
13
99°
78°
14
100°
79°
15
98°
78°
16
98°
76°
17
97°
75°
18
91°
71°
19
88°
68°
20
84°
65°
21
87°
65°
22
86°
68°
23
87°
66°
24
84°
63°
25
88°
68°
26
88°
69°
27
87°
68°
28
87°
68°
29
86°
67°
30
86°
67°
1
85°
66°
2
86°
66°
3
86°
65°
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 84° to 102°, with overnight lows between 63° and 79°. The average high for September is 90° with an average low of 70°. 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.
