S
M
T
W
T
F
S
30
91°
70°
31
86°
66°
1
84°
62°
2
83°
61°
3
83°
65°
4
82°
63°
5
87°
70°
6
84°
70°
7
90°
71°
8
91°
70°
9
91°
73°
10
88°
70°
11
85°
67°
12
83°
68°
13
84°
66°
14
84°
67°
15
83°
70°
16
84°
69°
17
83°
64°
18
78°
62°
19
79°
63°
20
83°
65°
21
84°
67°
22
82°
67°
23
81°
66°
24
80°
64°
25
81°
66°
26
85°
67°
27
84°
68°
28
84°
67°
29
83°
67°
30
83°
66°
1
84°
67°
2
83°
66°
3
81°
64°
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 78° to 91°, with overnight lows between 62° and 73°. The average high for September is 84° with an average low of 67°. 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.
