S
M
T
W
T
F
S
30
75°
55°
31
70°
57°
1
63°
47°
2
64°
46°
3
64°
50°
4
65°
47°
5
64°
48°
6
64°
51°
7
71°
50°
8
68°
48°
9
69°
47°
10
72°
52°
11
78°
59°
12
73°
50°
13
71°
49°
14
74°
53°
15
80°
60°
16
84°
61°
17
80°
59°
18
75°
56°
19
70°
52°
20
69°
51°
21
68°
49°
22
69°
48°
23
66°
53°
24
71°
52°
25
70°
47°
26
64°
47°
27
64°
52°
28
65°
53°
29
66°
51°
30
71°
53°
1
72°
53°
2
73°
54°
3
74°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thornlie
Thornlie's September 2026 forecast shows daily high temperatures ranging from 64° to 84°, with overnight lows between 47° and 61°. The average high for September is 72° with an average low of 53°. 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 Thornlie. See also: October | November | December.
