S
M
T
W
T
F
S
30
82°
65°
31
76°
64°
1
81°
61°
2
73°
54°
3
72°
60°
4
82°
65°
5
82°
65°
6
80°
64°
7
81°
63°
8
80°
63°
9
78°
62°
10
77°
62°
11
71°
56°
12
70°
56°
13
70°
55°
14
78°
54°
15
72°
48°
16
68°
49°
17
66°
48°
18
65°
44°
19
65°
47°
20
66°
54°
21
66°
51°
22
71°
56°
23
74°
56°
24
75°
54°
25
75°
51°
26
74°
54°
27
75°
46°
28
64°
53°
29
71°
43°
30
65°
53°
1
72°
40°
2
67°
38°
3
56°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Downtown
Downtown's September 2026 forecast shows daily high temperatures ranging from 56° to 82°, with overnight lows between 38° and 65°. The average high for September is 73° with an average low of 54°. 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 Downtown. See also: October | November | December.
