S
M
T
W
T
F
S
30
66°
54°
31
63°
55°
1
63°
55°
2
68°
57°
3
65°
54°
4
63°
52°
5
62°
57°
6
69°
55°
7
61°
51°
8
59°
53°
9
59°
52°
10
60°
52°
11
62°
52°
12
62°
50°
13
63°
53°
14
63°
53°
15
62°
52°
16
60°
53°
17
61°
52°
18
63°
53°
19
63°
53°
20
62°
52°
21
63°
53°
22
63°
52°
23
59°
50°
24
62°
53°
25
61°
52°
26
62°
52°
27
62°
51°
28
61°
52°
29
62°
52°
30
61°
51°
1
57°
50°
2
58°
51°
3
59°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Coleraine
Coleraine's September 2026 forecast shows daily high temperatures ranging from 57° to 69°, 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 Coleraine. See also: October | November | December.
