15.09
tue
tue
Day
70°F
N 12 mph
Precip.
25%
25%
Night
66°F
E 7 mph
Precip.
69%
69%
16.09
wed
wed
Day
68°F
NE 9 mph
Precip.
40%
40%
Night
68°F
NW 11 mph
Precip.
31%
31%
17.09
thu
thu
Day
66°F
W 12 mph
Precip.
50%
50%
Night
66°F
W 12 mph
Precip.
29%
29%
18.09
fri
fri
Day
70°F
W 13 mph
Precip.
25%
25%
Night
66°F
W 17 mph
Precip.
27%
27%
19.09
sat
sat
Day
70°F
W 14 mph
Precip.
24%
24%
Night
66°F
SW 12 mph
Precip.
12%
12%
20.09
sun
sun
Day
75°F
NW 6 mph
Precip.
6%
6%
Night
70°F
E 9 mph
Precip.
85%
85%
21.09
mon
mon
Day
77°F
SE 5 mph
Precip.
19%
19%
Night
72°F
SW 1 mph
Precip.
31%
31%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 73.4°F. The highest and lowest sea temperatures during the month were 74.8°F and 72.5°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: 06:01
September 15, tuesday
0900
70°F
NE
6 mph
6 mph
1200
70°F
N
12 mph
12 mph
1500
68°F
NE
13 mph
13 mph
1800
68°F
NE
10 mph
10 mph
2100
68°F
E
6 mph
6 mph
September 16, wednesday
0000
66°F
E
7 mph
7 mph
0300
66°F
NE
11 mph
11 mph
0600
66°F
N
12 mph
12 mph
