The highest day temperature in July 2026 was 88°F. The lowest night temperature was 60°F. The average values for day and night temperatures during July were 78.8°F и 66.9°F respectivly.

The average sea surface temperature in July 2026 for Niteroi was 74.9°F. The maximum and minimum values were 73.2°F and 77.0°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 5.8 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.