S
M
T
W
T
F
S
30
83°
61°
31
83°
52°
1
82°
50°
2
77°
51°
3
76°
57°
4
78°
60°
5
84°
50°
6
82°
49°
7
75°
49°
8
76°
57°
9
78°
56°
10
80°
54°
11
75°
54°
12
73°
51°
13
74°
46°
14
72°
46°
15
72°
50°
16
73°
53°
17
73°
54°
18
80°
54°
19
80°
52°
20
78°
53°
21
79°
51°
22
74°
48°
23
71°
44°
24
70°
42°
25
68°
43°
26
70°
43°
27
69°
42°
28
Hist. Avg.
71°
44°
29
Hist. Avg.
70°
43°
30
Hist. Avg.
70°
43°
1
Hist. Avg.
70°
42°
2
Hist. Avg.
69°
42°
3
Hist. Avg.
69°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Thomson
Thomson's September 2026 forecast shows daily high temperatures ranging from 68° to 84°, with overnight lows between 42° and 61°. The average high for September is 76° 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 Thomson. See also: October | November | December.
