S
M
T
W
T
F
S
30
67°
40°
31
76°
32°
1
79°
46°
2
75°
45°
3
70°
41°
4
69°
45°
5
73°
45°
6
73°
43°
7
59°
40°
8
62°
32°
9
72°
31°
10
79°
37°
11
65°
43°
12
72°
41°
13
69°
44°
14
57°
34°
15
69°
27°
16
71°
33°
17
73°
43°
18
71°
44°
19
56°
50°
20
68°
43°
21
72°
36°
22
72°
37°
23
72°
44°
24
77°
38°
25
80°
40°
26
59°
34°
27
60°
42°
28
64°
38°
29
70°
44°
30
69°
37°
1
70°
38°
2
67°
34°
3
58°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Basin
Basin's September 2026 forecast shows daily high temperatures ranging from 58° to 70°, with overnight lows between 30° and 44°. The average high for September is 65° with an average low of 37°. 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 Basin. See also: October | November | December.
