The climate in Niterói during December can be summarized as hot, humid and wet.
December is in the summer in Niterói and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 29°C (84°F), whilst at night 21°C (70°F) is normal.
|Daytime temperature||29°C 84.2°F|
|Nightly temperature||21.2°C 70.2°F|
|Average temperature||25.1°C 77.2°F|
|Daily sunshine||5.7 hrs|
|Avg rainfall||140 mm 5.5 ins|
|Rainy days||21 days|
|Sea temperature||24.8°C 76.6°F|
|Windspeed||9.4kph 6 mph|
On average December is the 3rd wettest month of the year in Niterói with around 140mm 5.5 inches of rain making it a wet time to visit. This rainfall is typically spread over 21 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.7 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Niterói in December 2021.
|Hottest month:||February||30.8°C 87.4°F|
|Driest month:||July||52mm 2ins|
|Coldest month:||July||25.1°C 77.2°F|
|Wettest month:||January||146mm 5.7ins|