S
M
T
W
T
F
S
30
70°
65°
31
75°
66°
1
83°
71°
2
83°
68°
3
82°
66°
4
77°
62°
5
76°
60°
6
74°
55°
7
77°
51°
8
81°
54°
9
77°
66°
10
77°
58°
11
72°
51°
12
80°
50°
13
79°
54°
14
69°
53°
15
74°
66°
16
75°
61°
17
75°
58°
18
73°
57°
19
72°
56°
20
67°
55°
21
70°
53°
22
68°
55°
23
70°
54°
24
71°
55°
25
72°
56°
26
71°
50°
27
73°
55°
28
74°
55°
29
69°
54°
30
67°
54°
1
70°
55°
2
72°
53°
3
68°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Niagara Falls
Niagara Falls's September 2026 forecast shows daily high temperatures ranging from 67° to 79°, with overnight lows between 50° and 66°. The average high for September is 71° with an average low of 55°. 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 Niagara Falls. See also: October | November | December.
