S
M
T
W
T
F
S
30
84°
63°
31
84°
62°
1
85°
58°
2
77°
55°
3
76°
54°
4
76°
54°
5
77°
55°
6
82°
61°
7
83°
61°
8
83°
60°
9
82°
60°
10
83°
61°
11
83°
60°
12
84°
60°
13
85°
62°
14
84°
51°
15
73°
51°
16
71°
50°
17
74°
52°
18
73°
50°
19
72°
48°
20
72°
48°
21
79°
51°
22
79°
55°
23
78°
47°
24
78°
46°
25
72°
45°
26
73°
49°
27
75°
53°
28
77°
52°
29
76°
44°
30
69°
44°
1
68°
51°
2
70°
49°
3
73°
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 68° to 85°, with overnight lows between 44° and 63°. The average high for September is 77° with an average low of 53°. 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.
