S
M
T
W
T
F
S
30
63°
51°
31
62°
50°
1
62°
51°
2
63°
52°
3
64°
50°
4
65°
50°
5
63°
52°
6
64°
53°
7
65°
54°
8
66°
53°
9
64°
53°
10
64°
54°
11
63°
54°
12
66°
53°
13
66°
54°
14
65°
53°
15
65°
51°
16
61°
49°
17
60°
51°
18
62°
48°
19
59°
47°
20
59°
46°
21
60°
49°
22
59°
48°
23
60°
49°
24
60°
49°
25
59°
51°
26
58°
51°
27
62°
48°
28
61°
47°
29
58°
47°
30
57°
46°
1
57°
46°
2
58°
47°
3
58°
48°
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 57° to 66°, with overnight lows between 46° and 54°. The average high for September is 62° with an average low of 50°. 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.
