S
M
T
W
T
F
S
30
73°
56°
31
75°
54°
1
77°
61°
2
75°
60°
3
80°
58°
4
75°
57°
5
70°
53°
6
75°
49°
7
79°
59°
8
72°
52°
9
72°
53°
10
75°
54°
11
63°
39°
12
65°
40°
13
65°
42°
14
63°
49°
15
68°
45°
16
63°
38°
17
67°
47°
18
65°
48°
19
71°
50°
20
72°
52°
21
72°
52°
22
70°
51°
23
69°
50°
24
64°
46°
25
69°
50°
26
68°
49°
27
68°
49°
28
59°
46°
29
57°
45°
30
59°
44°
1
56°
40°
2
57°
41°
3
61°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ottawa / Embrun Airport
Ottawa / Embrun Airport's September 2026 forecast shows daily high temperatures ranging from 56° to 80°, with overnight lows between 38° and 59°. The average high for September is 67° 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 Ottawa / Embrun Airport. See also: October | November | December.
