S
M
T
W
T
F
S
30
64°
54°
31
65°
55°
1
66°
54°
2
65°
55°
3
67°
55°
4
68°
54°
5
67°
54°
6
67°
55°
7
66°
55°
8
67°
54°
9
67°
55°
10
66°
55°
11
67°
53°
12
66°
51°
13
62°
49°
14
62°
51°
15
61°
53°
16
62°
54°
17
66°
50°
18
65°
50°
19
62°
52°
20
62°
52°
21
65°
51°
22
63°
51°
23
60°
52°
24
60°
53°
25
63°
48°
26
62°
49°
27
59°
51°
28
63°
52°
29
62°
50°
30
63°
52°
1
62°
50°
2
62°
49°
3
59°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Carrickfergus
Carrickfergus's September 2026 forecast shows daily high temperatures ranging from 59° to 68°, with overnight lows between 48° and 55°. The average high for September is 64° with an average low of 52°. 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 Carrickfergus. See also: October | November | December.
