S
M
T
W
T
F
S
30
66°
55°
31
64°
52°
1
61°
55°
2
61°
55°
3
63°
57°
4
63°
55°
5
63°
52°
6
66°
55°
7
61°
52°
8
59°
52°
9
63°
50°
10
61°
54°
11
63°
53°
12
66°
50°
13
64°
55°
14
66°
53°
15
61°
49°
16
60°
50°
17
58°
48°
18
59°
51°
19
60°
49°
20
61°
51°
21
60°
48°
22
61°
46°
23
60°
51°
24
61°
48°
25
57°
47°
26
56°
46°
27
56°
47°
28
57°
43°
29
55°
43°
30
56°
48°
1
57°
46°
2
57°
46°
3
56°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thornliebank
Thornliebank's September 2026 forecast shows daily high temperatures ranging from 55° to 66°, with overnight lows between 43° and 55°. The average high for September is 59° with an average low of 48°. 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 Thornliebank. See also: October | November | December.
