S
M
T
W
T
F
S
30
83°
56°
31
76°
66°
1
89°
69°
2
79°
71°
3
90°
70°
4
87°
62°
5
78°
60°
6
76°
55°
7
78°
58°
8
76°
57°
9
79°
60°
10
80°
58°
11
81°
58°
12
75°
56°
13
75°
55°
14
79°
59°
15
74°
59°
16
74°
61°
17
75°
53°
18
71°
52°
19
71°
52°
20
72°
54°
21
75°
59°
22
79°
60°
23
79°
60°
24
78°
58°
25
77°
55°
26
76°
57°
27
77°
58°
28
76°
57°
29
76°
56°
30
71°
52°
1
67°
49°
2
70°
53°
3
74°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Britain
New Britain's September 2026 forecast shows daily high temperatures ranging from 67° to 90°, with overnight lows between 49° and 71°. The average high for September is 77° with an average low of 58°. 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 Britain. See also: October | November | December.
