March weather forecast
Manaus, Brazil

The first month of the autumn, March, is still a hot month in Manaus, Brazil, with temperature in the range of an average high of 30.6°C (87.1°F) and an average low of 23.2°C (73.8°F).

Temperature

In Manaus, the average high-temperature in March is practically the same as in February - a still hot 30.6°C (87.1°F). In March, the average low-temperature is 23.2°C (73.8°F).

Heat index

In March, the average heat index is appraised at an extremely hot 42°C (107.6°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like differences in body mass, height, and shape, clothing, metabolic differences, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

March is the most humid month in Manaus, with an average relative humidity of 88%.

Rainfall

The month with the most rainfall is March, when the rain falls for 20 days and typically aggregates up to 335mm (13.19") of precipitation.

Daylight

In Manaus, the average length of the day in March is 12h and 8min.
On the first day of the month, sunrise is at 06:07 and sunset at 18:17. On the last day of March, sunrise is at 06:01 and sunset at 18:06 -04.

Sunshine

In Manaus, Brazil, the average sunshine in March is 3.2h.

UV index

The months with the highest UV index in Manaus are January through May, August through December, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 12 in March interpret into the following advice:
Take all necessary precautions, as unprotected skin can burn in minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise.