S
M
T
W
T
F
S
30
91°
73°
31
94°
74°
1
94°
76°
2
95°
76°
3
96°
77°
4
95°
75°
5
97°
73°
6
96°
72°
7
84°
69°
8
85°
71°
9
87°
70°
10
87°
69°
11
88°
70°
12
88°
70°
13
91°
69°
14
90°
68°
15
89°
67°
16
87°
66°
17
86°
67°
18
87°
66°
19
86°
62°
20
80°
65°
21
86°
66°
22
85°
65°
23
85°
65°
24
84°
64°
25
85°
65°
26
85°
65°
27
84°
64°
28
85°
65°
29
83°
64°
30
83°
63°
1
82°
63°
2
82°
60°
3
77°
57°
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 77° to 96°, with overnight lows between 57° and 72°. The average high for September is 86° with an average low of 66°. 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.
