S
M
T
W
T
F
S
30
78°
64°
31
79°
63°
1
77°
62°
2
72°
60°
3
71°
59°
4
71°
61°
5
74°
62°
6
78°
63°
7
79°
63°
8
79°
62°
9
78°
62°
10
79°
61°
11
76°
62°
12
78°
61°
13
78°
62°
14
75°
50°
15
67°
50°
16
68°
53°
17
70°
54°
18
67°
48°
19
68°
51°
20
68°
54°
21
75°
56°
22
75°
56°
23
74°
47°
24
67°
47°
25
68°
50°
26
73°
55°
27
73°
53°
28
68°
45°
29
66°
41°
30
61°
45°
1
61°
53°
2
68°
48°
3
69°
54°
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 79°, with overnight lows between 41° and 64°. The average high for September is 72° with an average low of 55°. 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.
