S
M
T
W
T
F
S
30
81°
66°
31
84°
70°
1
86°
66°
2
87°
65°
3
80°
64°
4
81°
65°
5
82°
71°
6
86°
71°
7
88°
70°
8
81°
70°
9
80°
71°
10
85°
70°
11
85°
67°
12
84°
70°
13
83°
65°
14
81°
63°
15
78°
64°
16
76°
62°
17
77°
62°
18
77°
63°
19
80°
66°
20
81°
68°
21
82°
64°
22
77°
60°
23
75°
65°
24
77°
66°
25
80°
59°
26
75°
63°
27
78°
64°
28
80°
64°
29
Hist. Avg.
76°
60°
30
Hist. Avg.
75°
59°
1
Hist. Avg.
75°
59°
2
Hist. Avg.
74°
58°
3
Hist. Avg.
74°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Downtown
Downtown's September 2026 forecast shows daily high temperatures ranging from 75° to 88°, with overnight lows between 59° and 71°. The average high for September is 81° 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.
