S
M
T
W
T
F
S
30
72°
43°
31
81°
43°
1
84°
53°
2
71°
54°
3
56°
44°
4
61°
43°
5
70°
43°
6
69°
44°
7
62°
46°
8
69°
44°
9
77°
44°
10
83°
51°
11
71°
49°
12
75°
48°
13
60°
46°
14
61°
42°
15
64°
39°
16
71°
44°
17
69°
46°
18
69°
47°
19
71°
52°
20
77°
46°
21
80°
48°
22
72°
38°
23
71°
36°
24
76°
43°
25
71°
36°
26
57°
32°
27
58°
26°
28
59°
26°
29
60°
28°
30
59°
27°
1
57°
29°
2
59°
26°
3
56°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Calendar
Calendar's September 2026 forecast shows daily high temperatures ranging from 56° to 76°, with overnight lows between 25° and 43°. The average high for September is 63° with an average low of 31°. 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 Calendar. See also: October | November | December.
