S
M
T
W
T
F
S
30
72°
53°
31
64°
52°
1
65°
52°
2
63°
50°
3
62°
44°
4
61°
48°
5
60°
48°
6
61°
44°
7
61°
37°
8
59°
39°
9
60°
36°
10
59°
35°
11
56°
37°
12
57°
35°
13
56°
37°
14
59°
42°
15
67°
46°
16
69°
47°
17
69°
46°
18
70°
47°
19
71°
49°
20
71°
47°
21
68°
47°
22
68°
46°
23
67°
40°
24
64°
40°
25
64°
39°
26
63°
41°
27
61°
40°
28
61°
38°
29
60°
41°
30
62°
40°
1
63°
41°
2
62°
40°
3
64°
37°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Monitor
Monitor's September 2026 forecast shows daily high temperatures ranging from 56° to 72°, with overnight lows between 35° and 53°. The average high for September is 63° with an average low of 43°. 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 Monitor. See also: October | November | December.
