S
M
T
W
T
F
S
30
71°
62°
31
68°
65°
1
76°
67°
2
78°
66°
3
82°
62°
4
79°
61°
5
78°
58°
6
71°
58°
7
76°
55°
8
78°
56°
9
73°
65°
10
78°
55°
11
70°
47°
12
76°
49°
13
79°
56°
14
69°
47°
15
69°
47°
16
76°
59°
17
78°
59°
18
70°
52°
19
63°
49°
20
69°
50°
21
60°
48°
22
64°
45°
23
67°
49°
24
66°
44°
25
72°
43°
26
75°
52°
27
77°
53°
28
69°
57°
29
68°
53°
30
69°
53°
1
70°
62°
2
67°
42°
3
61°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Ajax
Ajax's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Ajax. See also: October | November | December.
