S
M
T
W
T
F
S
30
99°
75°
31
100°
75°
1
100°
73°
2
88°
75°
3
88°
73°
4
95°
75°
5
91°
75°
6
95°
73°
7
97°
73°
8
97°
74°
9
95°
74°
10
96°
74°
11
96°
74°
12
97°
74°
13
96°
73°
14
95°
72°
15
94°
68°
16
90°
67°
17
90°
67°
18
89°
68°
19
90°
62°
20
84°
63°
21
87°
62°
22
90°
67°
23
90°
67°
24
89°
66°
25
85°
66°
26
88°
65°
27
88°
66°
28
87°
66°
29
87°
65°
30
85°
62°
1
80°
55°
2
77°
55°
3
77°
54°
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 77° to 97°, with overnight lows between 54° and 74°. The average high for September is 89° with an average low of 66°. 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.
