S
M
T
W
T
F
S
30
76°
55°
31
78°
53°
1
70°
46°
2
71°
55°
3
78°
51°
4
72°
49°
5
71°
44°
6
70°
50°
7
73°
42°
8
69°
41°
9
63°
39°
10
63°
38°
11
64°
43°
12
64°
39°
13
63°
36°
14
59°
35°
15
60°
36°
16
60°
36°
17
61°
35°
18
59°
37°
19
60°
40°
20
63°
37°
21
67°
43°
22
68°
46°
23
71°
35°
24
63°
44°
25
61°
37°
26
60°
33°
27
55°
40°
28
56°
40°
29
55°
38°
30
57°
38°
1
55°
31°
2
56°
35°
3
54°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sundown
Sundown's September 2026 forecast shows daily high temperatures ranging from 54° to 78°, with overnight lows between 31° and 55°. The average high for September is 64° with an average low of 41°. 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 Sundown. See also: October | November | December.
