March weather forecast
Belém, Brazil

The tropical character of the city remains in full swing in March, continuing with an overall warmth and the usual elevated humidity levels. Amidst consistent wet and humid conditions, the city experiences the highest rainfall of the year measuring 447mm (17.6") this month. Despite the heavy showers, this maritime city manages to maintain an inviting allure with its distinctive tropical monsoon climate. Serving as a perfect backdrop for the prominent religious event "Círio de Nazaré", March in Belém offers a unique blend of cultural vibrancy and natural beauty. Being part of this festival during the rainiest months could turn out to be quite an adventurous cultural exploration.

Temperature

Belém's coldest month, March, registers temperatures that range from a high of 30.4°C (86.7°F) to a low of 22.4°C (72.3°F).

Heat index

For March, the heat index is estimated at a blistering 43°C (109.4°F). Be cautious: Heat exhaustion along with heat cramps are predicted. Heatstroke is a possible consequence of continuous physical effort.
Be aware that heat index ratings are designed for shaded locations and minor breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Overheating dangers loom when the body's heat release mechanisms are overshadowed by excessive gain.

Humidity

February through April, with an average relative humidity of 91%, are the most humid months.

Rainfall

The month with the most rainfall is March, when the rain falls for 26 days and typically aggregates up to 447mm (17.6") of precipitation.

Sea temperature

In March, the average sea temperature is 28.3°C (82.9°F).
Note: Swimming, diving, and other water activities in the temperature range of 25°C (77°F) to 29°C (84.2°F) are perceived as very enjoyable and comfortable for prolonged durations.

Daylight

In March, the average length of the day is 12h and 7min.
On the first day of March, sunrise is at 06:21 and sunset at 18:30. On the last day of the month, sunrise is at 06:14 and sunset at 18:20 -03.

Sunshine

With an average of 3.3h of sunshine, March has the least sunshine of the year.

UV index

The months with the highest UV index in Belém are January through May, August through December, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: A daily high UV index of 12 in March leads to these guidelines:
Take all necessary precautions, as unprotected skin can burn in minutes. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Despite the cloudy weather, sunscreen with a sun protection factor of at least 30 should be liberally applied and reapplied, including after a swim or outdoor activity. Alert! Sand and water increase UV exposure due to their reflective properties.