The highest day temperature in July 2025 was 89°F. The lowest night temperature was 60°F. The average values for day and night temperatures during July were 74.3°F и 64.6°F respectivly.

The average sea surface temperature in July 2025 for Niteroi was 73.1°F. The maximum and minimum values were 71.8°F and 74.8°F respectively.

Most of the days in July are sunny but you can also expect cloudy and gloomy days.

Precipitation total in July for Niteroi is 0.4 in. It makes july the least rainy month of the year.

The average wind speed in July is 5.9 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 July is 7.7 hours.