S
M
T
W
T
F
S
30
65°
56°
31
N/A
1
63°
55°
2
67°
57°
3
64°
54°
4
61°
52°
5
63°
54°
6
63°
54°
7
64°
53°
8
62°
54°
9
63°
52°
10
62°
50°
11
63°
51°
12
62°
50°
13
63°
52°
14
64°
53°
15
62°
52°
16
62°
53°
17
63°
53°
18
63°
52°
19
62°
53°
20
61°
53°
21
63°
52°
22
63°
52°
23
60°
50°
24
60°
52°
25
62°
51°
26
61°
52°
27
62°
51°
28
62°
52°
29
61°
51°
30
62°
52°
1
62°
52°
2
61°
51°
3
62°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Portrush
Portrush's September 2026 forecast shows daily high temperatures ranging from 60° to 67°, with overnight lows between 50° and 57°. The average high for September is 62° 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 Portrush. See also: October | November | December.
