S
M
T
W
T
F
S
30
64°
56°
31
72°
55°
1
70°
57°
2
66°
54°
3
69°
54°
4
64°
52°
5
71°
56°
6
75°
54°
7
65°
56°
8
72°
55°
9
71°
56°
10
70°
56°
11
67°
54°
12
68°
54°
13
72°
55°
14
62°
57°
15
69°
57°
16
74°
55°
17
70°
53°
18
70°
55°
19
69°
52°
20
68°
54°
21
66°
53°
22
65°
51°
23
65°
50°
24
67°
55°
25
65°
53°
26
66°
54°
27
65°
53°
28
66°
53°
29
63°
51°
30
67°
49°
1
59°
49°
2
60°
51°
3
59°
50°
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 59° to 70°, with overnight lows between 49° and 55°. The average high for September is 65° with an average low of 52°. 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.
