S
M
T
W
T
F
S
30
83°
65°
31
87°
64°
1
88°
64°
2
88°
63°
3
87°
63°
4
86°
64°
5
86°
63°
6
87°
59°
7
85°
55°
8
76°
55°
9
77°
60°
10
76°
61°
11
84°
60°
12
82°
62°
13
84°
59°
14
84°
52°
15
80°
55°
16
72°
53°
17
74°
49°
18
73°
52°
19
75°
47°
20
72°
48°
21
71°
50°
22
72°
55°
23
77°
55°
24
79°
57°
25
79°
57°
26
80°
55°
27
79°
56°
28
77°
52°
29
76°
51°
30
75°
50°
1
74°
51°
2
77°
53°
3
70°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Newtown
Newtown's September 2026 forecast shows daily high temperatures ranging from 70° to 88°, with overnight lows between 43° and 65°. The average high for September is 79° 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 Newtown. See also: October | November | December.
