S
M
T
W
T
F
S
30
82°
58°
31
80°
58°
1
78°
62°
2
78°
63°
3
85°
63°
4
86°
62°
5
83°
61°
6
79°
58°
7
84°
61°
8
82°
55°
9
77°
54°
10
77°
54°
11
78°
55°
12
80°
53°
13
79°
60°
14
82°
54°
15
75°
52°
16
73°
53°
17
74°
52°
18
75°
56°
19
80°
50°
20
79°
54°
21
78°
56°
22
81°
50°
23
76°
49°
24
75°
49°
25
74°
50°
26
75°
55°
27
78°
54°
28
78°
55°
29
79°
49°
30
74°
48°
1
71°
54°
2
77°
54°
3
78°
50°
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 71° to 86°, with overnight lows between 48° and 63°. The average high for September is 78° with an average low of 55°. 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.
