S
M
T
W
T
F
S
30
71°
60°
31
69°
56°
1
68°
60°
2
69°
63°
3
69°
62°
4
66°
53°
5
66°
58°
6
69°
58°
7
67°
56°
8
66°
58°
9
66°
56°
10
65°
55°
11
64°
54°
12
65°
54°
13
66°
55°
14
63°
57°
15
62°
56°
16
61°
56°
17
62°
57°
18
63°
57°
19
62°
56°
20
62°
56°
21
63°
57°
22
62°
56°
23
63°
54°
24
60°
51°
25
59°
53°
26
60°
55°
27
62°
54°
28
62°
55°
29
63°
54°
30
63°
55°
1
62°
55°
2
63°
54°
3
62°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Castlemartin
Castlemartin's September 2026 forecast shows daily high temperatures ranging from 59° to 69°, with overnight lows between 51° and 63°. The average high for September is 64° with an average low of 56°. 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 Castlemartin. See also: October | November | December.
