S
M
T
W
T
F
S
30
99°
73°
31
98°
75°
1
98°
74°
2
95°
74°
3
96°
73°
4
97°
74°
5
100°
75°
6
102°
75°
7
102°
74°
8
101°
75°
9
98°
76°
10
99°
74°
11
96°
77°
12
101°
76°
13
100°
72°
14
100°
75°
15
100°
77°
16
100°
75°
17
100°
71°
18
98°
69°
19
101°
71°
20
100°
74°
21
97°
68°
22
93°
68°
23
94°
68°
24
90°
66°
25
90°
67°
26
90°
67°
27
92°
68°
28
89°
67°
29
82°
58°
30
86°
64°
1
87°
63°
2
81°
63°
3
83°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Boston
New Boston's September 2026 forecast shows daily high temperatures ranging from 81° to 101°, with overnight lows between 58° and 75°. The average high for September is 92° with an average low of 67°. 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 New Boston. See also: October | November | December.
