S
M
T
W
T
F
S
30
73°
56°
31
75°
54°
1
74°
57°
2
75°
63°
3
77°
59°
4
76°
56°
5
71°
55°
6
74°
55°
7
74°
52°
8
69°
55°
9
70°
53°
10
71°
54°
11
68°
53°
12
69°
53°
13
68°
51°
14
67°
45°
15
66°
54°
16
71°
53°
17
69°
48°
18
62°
46°
19
64°
45°
20
69°
53°
21
72°
53°
22
72°
54°
23
71°
51°
24
69°
50°
25
68°
51°
26
69°
51°
27
70°
52°
28
70°
48°
29
64°
44°
30
59°
41°
1
58°
44°
2
63°
49°
3
66°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ottawa East
Ottawa East's September 2026 forecast shows daily high temperatures ranging from 58° to 77°, with overnight lows between 41° and 63°. The average high for September is 69° with an average low of 51°. 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 Ottawa East. See also: October | November | December.
