S
M
T
W
T
F
S
30
90°
49°
31
81°
47°
1
76°
50°
2
90°
54°
3
90°
59°
4
98°
57°
5
95°
62°
6
97°
58°
7
89°
58°
8
80°
53°
9
80°
45°
10
90°
46°
11
75°
50°
12
65°
47°
13
74°
42°
14
70°
51°
15
68°
43°
16
79°
48°
17
78°
44°
18
74°
57°
19
64°
56°
20
55°
50°
21
63°
49°
22
68°
53°
23
77°
51°
24
82°
54°
25
77°
53°
26
74°
46°
27
74°
50°
28
70°
47°
29
68°
46°
30
69°
47°
1
70°
46°
2
60°
42°
3
71°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Buffalo
Buffalo's September 2026 forecast shows daily high temperatures ranging from 55° to 82°, with overnight lows between 42° and 54°. The average high for September is 70° with an average low of 49°. 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 Buffalo. See also: October | November | December.
