S
M
T
W
T
F
S
30
65°
52°
31
64°
54°
1
67°
53°
2
65°
53°
3
67°
52°
4
68°
53°
5
66°
50°
6
67°
53°
7
67°
52°
8
66°
51°
9
67°
53°
10
67°
53°
11
66°
50°
12
66°
49°
13
63°
48°
14
62°
49°
15
61°
51°
16
62°
52°
17
65°
48°
18
65°
47°
19
62°
51°
20
62°
50°
21
65°
49°
22
62°
50°
23
60°
50°
24
60°
51°
25
63°
46°
26
61°
48°
27
59°
50°
28
61°
51°
29
63°
49°
30
63°
51°
1
62°
47°
2
62°
47°
3
61°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rostrevor
Rostrevor's September 2026 forecast shows daily high temperatures ranging from 59° to 68°, with overnight lows between 46° and 54°. The average high for September is 64° 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 Rostrevor. See also: October | November | December.
