S
M
T
W
T
F
S
30
80°
67°
31
86°
58°
1
83°
59°
2
82°
47°
3
80°
51°
4
83°
56°
5
86°
64°
6
84°
63°
7
79°
67°
8
81°
62°
9
75°
53°
10
86°
53°
11
78°
52°
12
67°
46°
13
67°
41°
14
61°
42°
15
71°
43°
16
70°
35°
17
71°
45°
18
74°
53°
19
72°
54°
20
69°
45°
21
68°
38°
22
70°
38°
23
70°
46°
24
N/A
25
64°
59°
26
65°
49°
27
71°
50°
28
58°
47°
29
62°
50°
30
67°
46°
1
63°
44°
2
65°
44°
3
56°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Niagara
Niagara's September 2026 forecast shows daily high temperatures ranging from 56° to 71°, with overnight lows between 40° and 59°. The average high for September is 63° with an average low of 48°. 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. See also: October | November | December.
