S
M
T
W
T
F
S
30
77°
45°
31
81°
41°
1
82°
42°
2
85°
46°
3
86°
45°
4
85°
36°
5
75°
36°
6
74°
42°
7
81°
44°
8
79°
41°
9
73°
39°
10
73°
39°
11
76°
38°
12
76°
36°
13
74°
44°
14
77°
41°
15
79°
33°
16
70°
32°
17
68°
30°
18
67°
31°
19
68°
32°
20
69°
36°
21
71°
41°
22
76°
38°
23
67°
39°
24
66°
36°
25
65°
37°
26
66°
30°
27
66°
31°
28
65°
30°
29
65°
31°
30
66°
31°
1
Hist. Avg.
62°
32°
2
Hist. Avg.
62°
32°
3
Hist. Avg.
61°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Swan Valley
Swan Valley's September 2026 forecast shows daily high temperatures ranging from 65° to 86°, with overnight lows between 30° and 46°. The average high for September is 73° 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 Swan Valley. See also: October | November | December.
