S
M
T
W
T
F
S
30
74°
57°
31
76°
53°
1
77°
51°
2
71°
50°
3
70°
53°
4
74°
60°
5
75°
57°
6
77°
50°
7
71°
51°
8
69°
57°
9
70°
57°
10
74°
56°
11
73°
57°
12
68°
57°
13
70°
54°
14
67°
49°
15
65°
47°
16
65°
47°
17
66°
55°
18
68°
55°
19
70°
56°
20
74°
55°
21
71°
50°
22
69°
47°
23
64°
46°
24
63°
45°
25
63°
43°
26
63°
52°
27
65°
47°
28
Hist. Avg.
66°
46°
29
Hist. Avg.
66°
46°
30
Hist. Avg.
66°
45°
1
Hist. Avg.
65°
45°
2
Hist. Avg.
65°
45°
3
Hist. Avg.
64°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Ajax
Ajax's September 2026 forecast shows daily high temperatures ranging from 63° to 77°, with overnight lows between 43° and 60°. The average high for September is 70° with an average low of 52°. 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.
