S
M
T
W
T
F
S
30
76°
50°
31
74°
49°
1
73°
53°
2
72°
51°
3
74°
50°
4
73°
50°
5
71°
51°
6
71°
51°
7
70°
50°
8
71°
49°
9
72°
48°
10
71°
48°
11
70°
49°
12
69°
48°
13
70°
50°
14
70°
50°
15
74°
53°
16
76°
52°
17
77°
53°
18
76°
52°
19
75°
52°
20
Hist. Avg.
72°
49°
21
Hist. Avg.
71°
49°
22
Hist. Avg.
71°
48°
23
Hist. Avg.
70°
48°
24
Hist. Avg.
70°
48°
25
Hist. Avg.
69°
47°
26
Hist. Avg.
69°
47°
27
Hist. Avg.
68°
46°
28
Hist. Avg.
68°
46°
29
Hist. Avg.
68°
46°
30
Hist. Avg.
67°
45°
1
Hist. Avg.
67°
45°
2
Hist. Avg.
66°
45°
3
Hist. Avg.
66°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rio
Rio's September 2026 forecast shows daily high temperatures ranging from 69° to 77°, with overnight lows between 48° and 53°. The average high for September is 73° with an average low of 50°. 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 Rio. See also: October | November | December.
