S
M
T
W
T
F
S
30
79°
61°
31
81°
64°
1
84°
64°
2
84°
63°
3
85°
57°
4
83°
55°
5
77°
56°
6
77°
61°
7
78°
60°
8
81°
61°
9
82°
62°
10
77°
61°
11
81°
60°
12
81°
61°
13
80°
61°
14
80°
62°
15
82°
61°
16
82°
59°
17
80°
60°
18
79°
54°
19
79°
52°
20
74°
51°
21
71°
50°
22
71°
57°
23
72°
54°
24
76°
50°
25
69°
49°
26
69°
49°
27
71°
50°
28
75°
55°
29
74°
54°
30
75°
54°
1
69°
55°
2
68°
48°
3
71°
52°
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 68° to 85°, with overnight lows between 48° and 64°. The average high for September is 77° with an average low of 57°. 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.
