S
M
T
W
T
F
S
30
70°
48°
31
69°
49°
1
70°
47°
2
70°
48°
3
75°
54°
4
74°
51°
5
73°
52°
6
76°
51°
7
77°
52°
8
74°
54°
9
77°
49°
10
76°
43°
11
71°
42°
12
64°
41°
13
64°
42°
14
65°
40°
15
63°
41°
16
65°
41°
17
64°
44°
18
69°
42°
19
74°
40°
20
64°
38°
21
62°
39°
22
60°
40°
23
70°
47°
24
68°
46°
25
Hist. Avg.
66°
41°
26
Hist. Avg.
65°
41°
27
Hist. Avg.
65°
40°
28
Hist. Avg.
65°
40°
29
Hist. Avg.
64°
40°
30
Hist. Avg.
64°
39°
1
Hist. Avg.
64°
39°
2
Hist. Avg.
63°
39°
3
Hist. Avg.
63°
38°
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 60° to 77°, with overnight lows between 38° and 54°. The average high for September is 69° with an average low of 45°. 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.
