S
M
T
W
T
F
S
30
74°
56°
31
67°
51°
1
68°
49°
2
68°
50°
3
71°
58°
4
66°
58°
5
63°
53°
6
63°
55°
7
65°
54°
8
66°
57°
9
67°
54°
10
66°
56°
11
70°
57°
12
68°
59°
13
68°
56°
14
69°
49°
15
63°
53°
16
66°
54°
17
67°
54°
18
65°
52°
19
61°
51°
20
61°
51°
21
67°
53°
22
67°
53°
23
66°
52°
24
66°
51°
25
63°
51°
26
66°
49°
27
63°
50°
28
65°
49°
29
64°
48°
30
57°
47°
1
56°
47°
2
56°
48°
3
58°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in New Perth
New Perth's September 2026 forecast shows daily high temperatures ranging from 56° to 71°, with overnight lows between 47° and 59°. 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 New Perth. See also: October | November | December.
