S
M
T
W
T
F
S
30
85°
55°
31
77°
56°
1
77°
63°
2
82°
56°
3
82°
62°
4
83°
63°
5
85°
56°
6
84°
54°
7
76°
53°
8
75°
52°
9
75°
57°
10
79°
59°
11
81°
52°
12
74°
52°
13
75°
51°
14
74°
59°
15
79°
51°
16
82°
49°
17
73°
49°
18
71°
50°
19
71°
49°
20
72°
50°
21
70°
49°
22
69°
49°
23
71°
48°
24
73°
52°
25
76°
55°
26
77°
54°
27
78°
46°
28
71°
53°
29
70°
54°
30
76°
51°
1
69°
52°
2
70°
48°
3
66°
45°
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 66° to 85°, with overnight lows between 45° and 63°. The average high for September is 76° with an average low of 53°. 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.
