S
M
T
W
T
F
S
30
79°
66°
31
84°
61°
1
80°
56°
2
80°
49°
3
80°
59°
4
82°
57°
5
84°
64°
6
79°
69°
7
79°
65°
8
82°
55°
9
74°
51°
10
85°
56°
11
76°
51°
12
68°
48°
13
67°
46°
14
69°
51°
15
71°
51°
16
70°
50°
17
72°
53°
18
69°
50°
19
68°
45°
20
65°
45°
21
67°
51°
22
70°
52°
23
72°
51°
24
66°
49°
25
67°
49°
26
69°
48°
27
68°
50°
28
69°
49°
29
69°
47°
30
58°
47°
1
58°
44°
2
55°
40°
3
55°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Thompson
Thompson's September 2026 forecast shows daily high temperatures ranging from 55° to 85°, with overnight lows between 40° and 69°. The average high for September is 69° 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 Thompson. See also: October | November | December.
