S
M
T
W
T
F
S
30
89°
78°
31
89°
78°
1
88°
77°
2
86°
78°
3
87°
77°
4
86°
78°
5
87°
78°
6
89°
77°
7
90°
78°
8
88°
78°
9
88°
77°
10
89°
78°
11
87°
77°
12
87°
77°
13
88°
78°
14
88°
77°
15
86°
77°
16
88°
78°
17
88°
78°
18
88°
77°
19
87°
78°
20
88°
77°
21
89°
78°
22
88°
77°
23
86°
79°
24
87°
78°
25
87°
77°
26
88°
77°
27
Hist. Avg.
88°
77°
28
Hist. Avg.
88°
77°
29
Hist. Avg.
88°
76°
30
Hist. Avg.
88°
76°
1
Hist. Avg.
88°
76°
2
Hist. Avg.
88°
76°
3
Hist. Avg.
88°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Downtown Miami
Downtown Miami's September 2026 forecast shows daily high temperatures ranging from 86° to 90°, with overnight lows between 77° and 79°. The average high for September is 88° with an average low of 78°. 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 Miami. See also: October | November | December.
