S
M
T
W
T
F
S
30
79°
64°
31
79°
63°
1
80°
65°
2
79°
64°
3
83°
65°
4
84°
62°
5
78°
55°
6
79°
56°
7
81°
59°
8
84°
61°
9
84°
61°
10
83°
60°
11
76°
53°
12
77°
57°
13
81°
60°
14
82°
53°
15
75°
54°
16
74°
53°
17
73°
51°
18
75°
55°
19
79°
51°
20
74°
53°
21
80°
57°
22
80°
58°
23
79°
56°
24
79°
53°
25
78°
55°
26
79°
57°
27
79°
56°
28
76°
56°
29
78°
54°
30
76°
54°
1
77°
55°
2
77°
53°
3
76°
49°
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 73° to 84°, with overnight lows between 49° 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 Newtown. See also: October | November | December.
