S
M
T
W
T
F
S
30
88°
58°
31
80°
57°
1
80°
58°
2
81°
62°
3
80°
58°
4
82°
64°
5
85°
64°
6
87°
57°
7
84°
57°
8
78°
56°
9
78°
55°
10
77°
62°
11
80°
55°
12
81°
56°
13
75°
55°
14
76°
61°
15
80°
60°
16
83°
52°
17
83°
51°
18
74°
51°
19
72°
52°
20
73°
54°
21
73°
53°
22
72°
51°
23
71°
56°
24
72°
56°
25
72°
55°
26
77°
57°
27
77°
51°
28
79°
48°
29
70°
49°
30
69°
54°
1
70°
55°
2
74°
52°
3
75°
47°
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 69° to 88°, with overnight lows between 47° and 64°. The average high for September is 77° with an average low of 55°. 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.
