S
M
T
W
T
F
S
30
89°
63°
31
86°
65°
1
88°
67°
2
89°
66°
3
87°
66°
4
82°
65°
5
82°
62°
6
83°
63°
7
88°
65°
8
86°
65°
9
87°
64°
10
87°
64°
11
86°
63°
12
87°
64°
13
87°
64°
14
85°
63°
15
83°
63°
16
84°
64°
17
86°
64°
18
84°
63°
19
79°
61°
20
80°
62°
21
79°
61°
22
81°
56°
23
80°
57°
24
80°
54°
25
83°
57°
26
81°
60°
27
77°
60°
28
76°
58°
29
78°
58°
30
78°
56°
1
75°
50°
2
74°
49°
3
72°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Newton
Newton's September 2026 forecast shows daily high temperatures ranging from 72° to 89°, with overnight lows between 48° and 67°. The average high for September is 83° with an average low of 61°. 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 Newton. See also: October | November | December.
