S
M
T
W
T
F
S
30
79°
70°
31
90°
75°
1
94°
71°
2
94°
73°
3
94°
75°
4
95°
75°
5
91°
66°
6
83°
61°
7
82°
62°
8
91°
70°
9
89°
62°
10
81°
58°
11
82°
63°
12
83°
63°
13
84°
61°
14
79°
58°
15
81°
60°
16
81°
61°
17
82°
59°
18
76°
54°
19
76°
60°
20
80°
60°
21
77°
59°
22
76°
58°
23
79°
58°
24
79°
59°
25
78°
60°
26
79°
59°
27
79°
59°
28
78°
58°
29
77°
59°
30
75°
58°
1
73°
51°
2
64°
47°
3
64°
44°
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 64° to 91°, with overnight lows between 44° and 70°. The average high for September is 79° with an average low of 59°. 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.
