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°
57°
6
73°
56°
7
75°
59°
8
74°
65°
9
80°
61°
10
72°
54°
11
71°
54°
12
73°
58°
13
74°
59°
14
72°
55°
15
76°
60°
16
74°
59°
17
71°
56°
18
72°
50°
19
70°
52°
20
72°
57°
21
63°
55°
22
64°
54°
23
65°
55°
24
67°
55°
25
71°
54°
26
70°
53°
27
64°
53°
28
69°
54°
29
70°
56°
30
71°
56°
1
71°
55°
2
68°
52°
3
67°
48°
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 63° to 80°, with overnight lows between 48° and 65°. The average high for September is 71° with an average low of 56°. 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.
