S
M
T
W
T
F
S
30
84°
65°
31
84°
69°
1
93°
73°
2
87°
70°
3
89°
70°
4
87°
69°
5
82°
62°
6
81°
58°
7
81°
55°
8
86°
54°
9
89°
61°
10
87°
71°
11
82°
63°
12
79°
62°
13
87°
71°
14
77°
52°
15
78°
47°
16
88°
65°
17
86°
68°
18
81°
59°
19
78°
64°
20
79°
63°
21
69°
56°
22
67°
56°
23
67°
52°
24
68°
51°
25
73°
51°
26
74°
51°
27
76°
52°
28
75°
50°
29
76°
49°
30
75°
52°
1
73°
54°
2
73°
54°
3
67°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Middletown
Middletown's September 2026 forecast shows daily high temperatures ranging from 67° to 88°, with overnight lows between 49° and 68°. The average high for September is 75° 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 Middletown. See also: October | November | December.
