Niteroi Weather: September
 |
Average Day Temperature: | 83.2°F |
|
Average Night Temperature: | 71.4°F |
|
Sea Water Temperature: | 76.7°F |
|
Number of Sunny Days: | 16 days |
| Sunshine Hours: | 11.7 - 12.3 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 0.9 in | |
| detailed information | ||
forecast
| Niteroi |
Temperature
| Niteroi |
Air Temperature in September, °F
The highest day temperature in September 2025 was 98°F. The lowest night temperature was 61°F. The average values for day and night temperatures during September were 79.6°F и 68.6°F respectivly.
Niteroi Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Niteroi was 74.5°F. The maximum and minimum values were 73.0°F and 76.4°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Niteroi is 0.9 in. It makes september one of the least rainy months of the year.
The average wind speed in September is 6.7 mph. This value is relatively stable throughout the year.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Niteroi in September is 7.7 hours.
Niteroi on the Weather Map
| Angra dos Reis |  |
+80 |
| Armacao dos Buzios | |
+80 |
| Buzios | |
+80 |
| Florianopolis |  |
+76 |
| Fortaleza | |
+80 |
| Joao Pessoa |  |
+80 |
| Porto Alegre | |
+80 |
| Recife |  |
+82 |
| Rio de Janeiro | |
+88 |
| Rio Grande | |
+78 |
| Salvador | |
+84 |
| Santos |  |
+82 |
| Sao Paulo | |
+82 |
| Sao Sebastiao | |
+84 |
| Xangri-la | |
+76 |
| 1800 |  |
86°F | W 10 mph |
| 2100 |  |
80°F | SW 7 mph |
| 0000 | |
78°F | SW 6 mph |
| 0300 | |
76°F | SW 5 mph |
| 0600 | |
80°F | SW 6 mph |
| 0900 | |
94°F | W 2 mph |
| 1200 | |
98°F | NW 7 mph |
| 1500 | |
96°F | NW 9 mph |