S
M
T
W
T
F
S
30
64°
54°
31
66°
55°
1
66°
55°
2
67°
54°
3
65°
56°
4
66°
55°
5
67°
53°
6
64°
54°
7
64°
53°
8
63°
50°
9
62°
50°
10
62°
51°
11
63°
50°
12
62°
50°
13
62°
49°
14
63°
53°
15
62°
50°
16
62°
50°
17
61°
49°
18
62°
48°
19
61°
49°
20
62°
50°
21
63°
51°
22
61°
49°
23
60°
48°
24
60°
49°
25
61°
50°
26
61°
52°
27
60°
49°
28
60°
48°
29
59°
46°
30
59°
48°
1
60°
47°
2
59°
52°
3
60°
46°
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 67°, with overnight lows between 46° and 56°. The average high for September is 62° with an average low of 51°. 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.
