S
M
T
W
T
F
S
30
105°
77°
31
103°
77°
1
101°
75°
2
101°
76°
3
100°
78°
4
99°
74°
5
101°
76°
6
102°
74°
7
102°
74°
8
103°
74°
9
99°
74°
10
83°
70°
11
92°
63°
12
94°
70°
13
90°
67°
14
99°
71°
15
94°
69°
16
92°
70°
17
98°
72°
18
98°
71°
19
99°
71°
20
78°
65°
21
76°
63°
22
78°
57°
23
80°
59°
24
82°
65°
25
77°
67°
26
84°
64°
27
87°
65°
28
84°
63°
29
78°
57°
30
77°
56°
1
76°
57°
2
76°
52°
3
75°
58°
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 75° to 87°, with overnight lows between 52° and 67°. The average high for September is 80° with an average low of 60°. 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.
