S
M
T
W
T
F
S
26
75°
63°
27
74°
64°
28
74°
62°
29
75°
62°
30
74°
63°
31
75°
63°
1
75°
64°
2
76°
65°
3
77°
64°
4
77°
64°
5
79°
66°
6
80°
68°
7
81°
68°
8
79°
69°
9
79°
68°
10
82°
69°
11
76°
68°
12
81°
67°
13
82°
67°
14
76°
66°
15
76°
66°
16
81°
67°
17
80°
68°
18
77°
67°
19
77°
69°
20
81°
70°
21
82°
66°
22
74°
65°
23
75°
68°
24
Hist. Avg.
76°
64°
25
Hist. Avg.
76°
64°
26
Hist. Avg.
76°
64°
27
Hist. Avg.
76°
64°
28
Hist. Avg.
76°
64°
29
Hist. Avg.
76°
65°
30
Hist. Avg.
75°
65°
31
Hist. Avg.
75°
65°
1
Hist. Avg.
75°
65°
2
Hist. Avg.
75°
65°
3
Hist. Avg.
75°
65°
4
Hist. Avg.
75°
65°
5
Hist. Avg.
75°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Rio de Janeiro
Rio de Janeiro's August 2026 forecast shows daily high temperatures ranging from 74° to 82°, with overnight lows between 62° and 70°. The average high for August is 78° 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 August weather will actually feel in Rio de Janeiro. See also: September | October | November.
