S
M
T
W
T
F
S
26
79°
68°
27
80°
68°
28
80°
69°
29
81°
68°
30
81°
68°
1
82°
69°
2
82°
68°
3
78°
68°
4
79°
69°
5
80°
68°
6
77°
68°
7
80°
67°
8
81°
68°
9
82°
67°
10
82°
68°
11
81°
67°
12
82°
70°
13
80°
70°
14
82°
69°
15
81°
68°
16
76°
66°
17
76°
65°
18
75°
65°
19
75°
66°
20
76°
65°
21
76°
67°
22
80°
69°
23
76°
65°
24
81°
64°
25
75°
64°
26
74°
67°
27
76°
68°
28
80°
67°
29
75°
68°
30
76°
70°
31
79°
69°
1
80°
65°
2
76°
65°
3
75°
70°
4
79°
69°
5
81°
70°
6
80°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Rio de Janeiro
Rio de Janeiro's May 2026 forecast shows daily high temperatures ranging from 74° to 82°, with overnight lows between 64° and 70°. The average high for May is 79° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Rio de Janeiro. See also: June | July | August.
