17.05
sun
sun
Day
81°F
N 5 mph
Precip.
0%
0%
Night
72°F
E 7 mph
Precip.
100%
100%
18.05
mon
mon
Day
77°F
NE 9 mph
Precip.
100%
100%
Night
73°F
SW 2 mph
Precip.
100%
100%
19.05
tue
tue
Day
70°F
E 9 mph
Precip.
100%
100%
Night
70°F
E 6 mph
Precip.
100%
100%
20.05
wed
wed
Day
72°F
E 2 mph
Precip.
75%
75%
Night
68°F
W 3 mph
Precip.
100%
100%
21.05
thu
thu
Day
68°F
NW 1 mph
Precip.
100%
100%
Night
68°F
NW 5 mph
Precip.
100%
100%
22.05
fri
fri
Day
70°F
W 4 mph
Precip.
82%
82%
Night
68°F
E 3 mph
Precip.
100%
100%
23.05
sat
sat
Day
70°F
W 10 mph
Precip.
100%
100%
Night
68°F
W 7 mph
Precip.
74%
74%
24.05
sun
sun
Day
73°F
NW 3 mph
Precip.
100%
100%
Night
68°F
W 4 mph
Precip.
0%
0%
25.05
mon
mon
Day
75°F
NW 6 mph
Precip.
100%
100%
Night
68°F
SW 6 mph
Precip.
88%
88%
26.05
tue
tue
Day
75°F
W 6 mph
Precip.
68%
68%
Night
68°F
SW 6 mph
Precip.
0%
0%
27.05
wed
wed
Day
81°F
W 1 mph
Precip.
0%
0%
Night
70°F
S 6 mph
Precip.
0%
0%
28.05
thu
thu
Day
79°F
NE 8 mph
Precip.
0%
0%
Night
72°F
SE 4 mph
Precip.
60%
60%
29.05
fri
fri
Day
75°F
NE 7 mph
Precip.
100%
100%
Night
70°F
W 3 mph
Precip.
100%
100%
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 75.9°F. The highest and lowest sea temperatures during the month were 77.0°F and 74.3°F.
Air temperature in Niteroi, °F
Precipitation total in Niteroi, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Niteroi
Niteroi on a weather map
Places in Brazil:
Name
°F
24 Hours Forecast
Niteroi
Local time: 01:51
May 17, sunday
0300
70°F
SW
2 mph
2 mph
0600
70°F
SW
4 mph
4 mph
0900
75°F
SW
2 mph
2 mph
1200
81°F
N
5 mph
5 mph
1500
79°F
N
7 mph
7 mph
1800
72°F
E
7 mph
7 mph
2100
72°F
E
8 mph
8 mph
May 18, monday
0000
72°F
E
7 mph
7 mph
