S
M
T
W
T
F
S
30
69°
52°
31
71°
48°
1
64°
46°
2
61°
46°
3
62°
47°
4
63°
44°
5
68°
50°
6
70°
50°
7
70°
49°
8
69°
50°
9
69°
50°
10
67°
49°
11
69°
49°
12
68°
50°
13
69°
50°
14
62°
37°
15
59°
36°
16
60°
39°
17
61°
42°
18
60°
37°
19
58°
38°
20
58°
36°
21
60°
46°
22
66°
44°
23
65°
36°
24
60°
32°
25
55°
40°
26
61°
42°
27
63°
43°
28
63°
42°
29
59°
33°
30
54°
31°
1
53°
37°
2
56°
36°
3
57°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thetford Mines
Thetford Mines's September 2026 forecast shows daily high temperatures ranging from 53° to 71°, with overnight lows between 30° and 52°. The average high for September is 63° with an average low of 42°. 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 Thetford Mines. See also: October | November | December.
