Measurements:
°C
°F
CURRENT WEATHER
17:46
Niteroi
70°F
W 9 mph
Feels like: 70°F
Precip: 31%
World Resorts Brazil Niteroi Weather

7 Day Weather Forecast

09.08
tue
DAY
68°F
W 6 mph
precip
26%
NIGHT
68°F
SW 6 mph
precip
21%
09.09
wed
DAY
72°F
NW 4 mph
precip
55%
NIGHT
72°F
S 6 mph
precip
30%
09.10
thu
DAY
78°F
SE 8 mph
precip
29%
NIGHT
74°F
SE 6 mph
precip
33%
09.11
fri
DAY
84°F
S 12 mph
precip
16%
NIGHT
78°F
S 9 mph
precip
9%
09.12
sat
DAY
84°F
S 7 mph
precip
5%
NIGHT
70°F
N 11 mph
precip
33%
09.13
sun
DAY
70°F
W 14 mph
precip
29%
NIGHT
66°F
W 21 mph
precip
76%
09.14
mon
DAY
66°F
W 22 mph
precip
81%
NIGHT
68°F
W 6 mph
precip
29%

Niteroi Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Niteroi was 22.2°F. The maximum and minimum values were 21.5°F and 23.2°F respectively.

Niteroi on the Weather Map

Best Time to Visit Niteroi
The most sunny months:
July 19 days
August 18 days
June 16 days
The most warm months:
February 88.5 °F
March 88.0 °F
January 87.6 °F
Warmest sea temperature:
February 84.0 °F
January 83.4 °F
March 83.0 °F
The most cold months:
July 79.5 °F
June 79.7 °F
August 80.0 °F
The most rainy months:
February 5 days
December 5 days
January 5 days
The most windy months:
October 6 mph
September 6 mph
August 6 mph
more details