S
M
T
W
T
F
S
30
63°
55°
31
64°
56°
1
65°
54°
2
67°
55°
3
64°
54°
4
65°
55°
5
64°
52°
6
63°
53°
7
62°
52°
8
63°
51°
9
61°
51°
10
61°
52°
11
62°
49°
12
61°
51°
13
61°
49°
14
62°
51°
15
60°
51°
16
62°
50°
17
62°
51°
18
61°
50°
19
64°
49°
20
60°
48°
21
59°
51°
22
59°
48°
23
60°
46°
24
59°
48°
25
58°
52°
26
59°
52°
27
61°
49°
28
58°
47°
29
57°
46°
30
57°
45°
1
58°
46°
2
58°
50°
3
59°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thornley
Thornley's September 2026 forecast shows daily high temperatures ranging from 57° to 67°, with overnight lows between 45° and 56°. The average high for September is 61° with an average low of 50°. 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 Thornley. See also: October | November | December.
