S
M
T
W
T
F
S
30
72°
58°
31
72°
57°
1
73°
61°
2
75°
63°
3
76°
63°
4
75°
62°
5
78°
62°
6
80°
63°
7
78°
62°
8
76°
61°
9
74°
61°
10
76°
60°
11
75°
61°
12
73°
61°
13
73°
60°
14
76°
59°
15
75°
59°
16
75°
58°
17
74°
59°
18
76°
59°
19
76°
58°
20
72°
58°
21
78°
56°
22
77°
47°
23
68°
45°
24
67°
53°
25
71°
55°
26
69°
54°
27
71°
55°
28
74°
53°
29
75°
56°
30
76°
57°
1
76°
52°
2
75°
50°
3
71°
54°
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 80°, with overnight lows between 45° and 63°. The average high for September is 74° with an average low of 57°. 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.
