S
M
T
W
T
F
S
30
80°
62°
31
82°
65°
1
86°
65°
2
86°
64°
3
85°
58°
4
85°
56°
5
78°
57°
6
78°
63°
7
80°
62°
8
83°
61°
9
84°
62°
10
80°
61°
11
83°
60°
12
83°
61°
13
82°
61°
14
82°
60°
15
83°
61°
16
83°
59°
17
82°
60°
18
81°
55°
19
81°
53°
20
75°
51°
21
73°
50°
22
72°
57°
23
73°
54°
24
78°
50°
25
71°
49°
26
71°
49°
27
73°
50°
28
77°
54°
29
76°
53°
30
77°
52°
1
71°
54°
2
71°
47°
3
68°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Brunswick
New Brunswick's September 2026 forecast shows daily high temperatures ranging from 68° to 86°, with overnight lows between 47° and 65°. The average high for September is 79° 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 Brunswick. See also: October | November | December.
