26.08
wed
wed
Day
70°F
NW 4 mph
Precip.
41%
41%
Night
70°F
SW 6 mph
Precip.
32%
32%
27.08
thu
thu
Day
72°F
SW 9 mph
Precip.
25%
25%
Night
72°F
SE 7 mph
Precip.
12%
12%
28.08
fri
fri
Day
77°F
NW 6 mph
Precip.
5%
5%
Night
75°F
SW 6 mph
Precip.
9%
9%
29.08
sat
sat
Day
86°F
S 6 mph
Precip.
12%
12%
Night
75°F
S 7 mph
Precip.
8%
8%
30.08
sun
sun
Day
73°F
NE 12 mph
Precip.
17%
17%
Night
70°F
NE 6 mph
Precip.
19%
19%
31.08
mon
mon
Day
84°F
S 4 mph
Precip.
4%
4%
Night
72°F
NE 16 mph
Precip.
16%
16%
01.09
tue
tue
Day
73°F
N 9 mph
Precip.
9%
9%
Night
70°F
NW 10 mph
Precip.
82%
82%
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 73.8°F. The highest and lowest sea temperatures during the month were 76.1°F and 72.5°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 72.0°F. The highest and lowest sea temperatures during the month were 73.8°F and 70.7°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: 01:46
August 26, wednesday
0300
68°F
SW
6 mph
6 mph
0600
68°F
SW
2 mph
2 mph
0900
68°F
SE
2 mph
2 mph
1200
70°F
NW
4 mph
4 mph
1500
72°F
NW
11 mph
11 mph
1800
70°F
W
13 mph
13 mph
2100
70°F
W
12 mph
12 mph
August 27, thursday
0000
70°F
SW
6 mph
6 mph
