S
M
T
W
T
F
S
30
71°
50°
31
72°
58°
1
76°
58°
2
71°
60°
3
76°
59°
4
78°
49°
5
78°
54°
6
71°
49°
7
68°
50°
8
73°
55°
9
75°
55°
10
77°
54°
11
74°
52°
12
70°
56°
13
71°
52°
14
75°
49°
15
66°
53°
16
67°
52°
17
65°
53°
18
67°
47°
19
70°
48°
20
65°
50°
21
70°
44°
22
65°
49°
23
67°
46°
24
71°
51°
25
72°
50°
26
70°
50°
27
69°
52°
28
70°
48°
29
69°
42°
30
62°
49°
1
67°
46°
2
70°
42°
3
66°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thorndale
Thorndale's September 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 40° and 60°. The average high for September is 70° with an average low of 51°. 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 Thorndale. See also: October | November | December.
