S
M
T
W
T
F
S
30
90°
65°
31
96°
66°
1
99°
71°
2
98°
72°
3
98°
71°
4
95°
71°
5
95°
68°
6
85°
63°
7
84°
63°
8
86°
66°
9
87°
63°
10
84°
61°
11
81°
55°
12
79°
57°
13
80°
56°
14
79°
54°
15
80°
60°
16
81°
59°
17
82°
59°
18
82°
58°
19
81°
59°
20
82°
59°
21
82°
58°
22
81°
58°
23
81°
57°
24
80°
58°
25
82°
57°
26
82°
56°
27
81°
57°
28
81°
56°
29
80°
55°
30
80°
55°
1
79°
54°
2
79°
54°
3
78°
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 78° to 99°, with overnight lows between 53° and 72°. The average high for September is 84° with an average low of 60°. 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.
