S
M
T
W
T
F
S
30
99°
71°
31
100°
73°
1
98°
75°
2
99°
77°
3
99°
76°
4
99°
74°
5
101°
75°
6
101°
73°
7
97°
76°
8
100°
77°
9
99°
70°
10
80°
65°
11
89°
68°
12
87°
69°
13
92°
67°
14
94°
63°
15
81°
58°
16
80°
57°
17
79°
57°
18
75°
52°
19
74°
52°
20
75°
54°
21
79°
53°
22
84°
58°
23
83°
59°
24
85°
60°
25
84°
59°
26
83°
59°
27
83°
58°
28
82°
59°
29
83°
58°
30
80°
54°
1
79°
49°
2
69°
45°
3
67°
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 67° to 100°, with overnight lows between 44° and 77°. The average high for September is 83° 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.
