S
M
T
W
T
F
S
30
70°
65°
31
75°
66°
1
83°
71°
2
83°
68°
3
82°
66°
4
77°
62°
5
76°
60°
6
74°
55°
7
77°
51°
8
81°
54°
9
77°
66°
10
77°
58°
11
72°
51°
12
80°
50°
13
82°
61°
14
69°
51°
15
77°
49°
16
78°
66°
17
76°
64°
18
71°
57°
19
68°
59°
20
66°
53°
21
62°
47°
22
63°
47°
23
63°
51°
24
64°
54°
25
68°
52°
26
69°
54°
27
70°
53°
28
67°
51°
29
70°
55°
30
68°
55°
1
66°
54°
2
67°
48°
3
61°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Tonawanda
Tonawanda's September 2026 forecast shows daily high temperatures ranging from 61° to 70°, with overnight lows between 47° and 59°. The average high for September is 66° 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 Tonawanda. See also: October | November | December.
