S
M
T
W
T
F
S
30
76°
53°
31
70°
50°
1
67°
50°
2
67°
49°
3
68°
48°
4
67°
46°
5
67°
46°
6
70°
51°
7
71°
52°
8
75°
44°
9
72°
49°
10
73°
51°
11
72°
44°
12
71°
45°
13
72°
51°
14
73°
49°
15
73°
40°
16
71°
38°
17
63°
40°
18
65°
48°
19
64°
42°
20
68°
38°
21
62°
45°
22
62°
47°
23
63°
45°
24
68°
46°
25
65°
45°
26
69°
46°
27
64°
36°
28
68°
36°
29
67°
34°
30
56°
38°
1
57°
35°
2
56°
36°
3
56°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Fredericton
Fredericton's September 2026 forecast shows daily high temperatures ranging from 56° to 76°, with overnight lows between 34° and 53°. The average high for September is 67° with an average low of 44°. 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 Fredericton. See also: October | November | December.
