S
M
T
W
T
F
S
30
80°
60°
31
81°
60°
1
79°
59°
2
74°
57°
3
73°
56°
4
73°
57°
5
76°
58°
6
80°
59°
7
81°
59°
8
81°
58°
9
80°
59°
10
81°
58°
11
78°
58°
12
80°
57°
13
80°
58°
14
77°
46°
15
69°
47°
16
70°
51°
17
72°
50°
18
69°
44°
19
70°
48°
20
70°
50°
21
77°
53°
22
77°
52°
23
76°
43°
24
69°
43°
25
70°
47°
26
75°
52°
27
75°
50°
28
70°
42°
29
68°
38°
30
63°
42°
1
63°
50°
2
70°
45°
3
71°
51°
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 63° to 81°, with overnight lows between 38° and 60°. The average high for September is 74° 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.
