S
M
T
W
T
F
S
30
98°
80°
31
91°
81°
1
89°
82°
2
93°
81°
3
90°
81°
4
93°
81°
5
91°
81°
6
88°
79°
7
95°
81°
8
94°
77°
9
89°
76°
10
91°
76°
11
93°
77°
12
93°
78°
13
93°
76°
14
92°
77°
15
90°
76°
16
91°
75°
17
89°
74°
18
90°
73°
19
90°
73°
20
89°
71°
21
90°
70°
22
91°
73°
23
89°
74°
24
89°
74°
25
88°
73°
26
89°
73°
27
89°
72°
28
88°
73°
29
87°
73°
30
87°
70°
1
82°
64°
2
79°
63°
3
80°
63°
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 79° to 94°, with overnight lows between 63° and 78°. The average high for September is 89° with an average low of 73°. 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.
