S
M
T
W
T
F
S
30
72°
52°
31
72°
56°
1
73°
59°
2
70°
59°
3
78°
58°
4
79°
58°
5
78°
54°
6
74°
49°
7
70°
54°
8
76°
54°
9
72°
49°
10
71°
54°
11
71°
49°
12
72°
50°
13
71°
55°
14
75°
49°
15
68°
51°
16
65°
54°
17
66°
52°
18
65°
53°
19
71°
44°
20
66°
49°
21
69°
45°
22
71°
47°
23
70°
45°
24
71°
44°
25
70°
51°
26
71°
51°
27
68°
52°
28
70°
51°
29
71°
43°
30
63°
48°
1
68°
51°
2
70°
48°
3
69°
45°
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 63° to 79°, with overnight lows between 43° and 59°. The average high for September is 71° with an average low of 51°. 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.
