S
M
T
W
T
F
S
30
66°
52°
31
68°
52°
1
66°
53°
2
69°
54°
3
67°
54°
4
67°
55°
5
64°
51°
6
64°
51°
7
66°
50°
8
63°
55°
9
63°
51°
10
65°
50°
11
63°
53°
12
62°
52°
13
62°
53°
14
64°
54°
15
66°
51°
16
66°
49°
17
66°
51°
18
Hist. Avg.
63°
50°
19
Hist. Avg.
63°
50°
20
Hist. Avg.
63°
50°
21
Hist. Avg.
62°
50°
22
Hist. Avg.
62°
50°
23
Hist. Avg.
62°
50°
24
Hist. Avg.
62°
50°
25
Hist. Avg.
62°
50°
26
Hist. Avg.
61°
49°
27
Hist. Avg.
61°
49°
28
Hist. Avg.
61°
49°
29
Hist. Avg.
61°
49°
30
Hist. Avg.
61°
49°
1
Hist. Avg.
60°
49°
2
Hist. Avg.
60°
49°
3
Hist. Avg.
60°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Porth
Porth's September 2026 forecast shows daily high temperatures ranging from 62° to 69°, with overnight lows between 49° and 55°. The average high for September is 65° 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 Porth. See also: October | November | December.
