S
M
T
W
T
F
S
30
84°
65°
31
91°
70°
1
94°
73°
2
95°
74°
3
95°
75°
4
96°
73°
5
91°
69°
6
79°
64°
7
80°
63°
8
86°
69°
9
88°
69°
10
77°
55°
11
80°
61°
12
80°
63°
13
82°
64°
14
82°
65°
15
77°
58°
16
75°
53°
17
77°
55°
18
77°
53°
19
74°
52°
20
71°
53°
21
76°
58°
22
69°
58°
23
73°
57°
24
78°
58°
25
79°
58°
26
79°
57°
27
78°
58°
28
78°
58°
29
77°
59°
30
79°
58°
1
78°
54°
2
76°
47°
3
64°
44°
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 64° to 88°, with overnight lows between 44° and 69°. The average high for September is 77° with an average low of 58°. 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.
