S
M
T
W
T
F
S
30
78°
47°
31
74°
48°
1
72°
45°
2
71°
48°
3
73°
47°
4
80°
46°
5
78°
52°
6
72°
47°
7
70°
45°
8
69°
44°
9
69°
44°
10
68°
45°
11
70°
47°
12
75°
48°
13
78°
48°
14
77°
50°
15
77°
51°
16
75°
52°
17
77°
51°
18
70°
48°
19
74°
52°
20
76°
51°
21
77°
52°
22
76°
50°
23
67°
50°
24
66°
42°
25
66°
42°
26
65°
49°
27
64°
42°
28
64°
41°
29
65°
42°
30
65°
43°
1
66°
48°
2
71°
48°
3
72°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oakville
Oakville's September 2026 forecast shows daily high temperatures ranging from 64° to 80°, with overnight lows between 41° and 52°. The average high for September is 72° with an average low of 47°. 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 Oakville. See also: October | November | December.
