S
M
T
W
T
F
S
30
87°
65°
31
85°
58°
1
82°
57°
2
79°
58°
3
80°
58°
4
80°
59°
5
81°
58°
6
77°
57°
7
78°
57°
8
78°
60°
9
79°
57°
10
76°
56°
11
78°
58°
12
78°
55°
13
79°
56°
14
77°
55°
15
76°
57°
16
77°
55°
17
76°
54°
18
75°
54°
19
75°
59°
20
79°
59°
21
Hist. Avg.
77°
58°
22
Hist. Avg.
76°
57°
23
Hist. Avg.
76°
57°
24
Hist. Avg.
76°
56°
25
Hist. Avg.
75°
56°
26
Hist. Avg.
75°
55°
27
Hist. Avg.
74°
55°
28
Hist. Avg.
74°
55°
29
Hist. Avg.
74°
54°
30
Hist. Avg.
73°
54°
1
Hist. Avg.
73°
53°
2
Hist. Avg.
72°
53°
3
Hist. Avg.
72°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Middletown
Middletown's September 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 54° and 65°. The average high for September is 79° with an average low of 57°. 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.
