S
M
T
W
T
F
S
30
64°
54°
31
65°
55°
1
65°
56°
2
67°
55°
3
64°
56°
4
65°
55°
5
66°
53°
6
63°
55°
7
63°
54°
8
64°
51°
9
62°
50°
10
62°
50°
11
63°
51°
12
61°
50°
13
61°
50°
14
62°
53°
15
62°
50°
16
61°
51°
17
60°
49°
18
61°
48°
19
61°
49°
20
60°
50°
21
62°
51°
22
60°
49°
23
60°
48°
24
61°
49°
25
60°
50°
26
60°
52°
27
61°
50°
28
60°
49°
29
59°
46°
30
60°
47°
1
59°
48°
2
58°
52°
3
60°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Larne
Larne's September 2026 forecast shows daily high temperatures ranging from 58° 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 Larne. See also: October | November | December.
