April weather forecast
São Mateus do Maranhão, Brazil

April, like March, in São Mateus do Maranhão, Brazil, is a moderately hot autumn month, with an average temperature varying between 29.9°C (85.8°F) and 22.3°C (72.1°F).

Temperature

April, with its average high-temperature of 29.9°C (85.8°F) and an average low-temperature of 22.3°C (72.1°F), holds the record as the coldest month.

Heat index

The heat index in April is appraised at an extremely hot 41°C (105.8°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Understanding the heat index involves considering values for shaded locales with light wind. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. It is important to note that direct sunlight can intensify the weather impact, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Youngsters generally face more threats than adults given their lesser ability to sweat. Coupled with their larger skin surface relative to their small bodies and higher heat production due to their activities, they are more endangered.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

With an average relative humidity of 91%, April is the most humid month in São Mateus do Maranhão.

Rainfall

In São Mateus do Maranhão, in April, it is raining for 28.7 days, with typically 225mm (8.86") of accumulated precipitation. In São Mateus do Maranhão, Brazil, during the entire year, the rain falls for 247.2 days and collects up to 1281mm (50.43") of precipitation.

Daylight

The average length of the day in April in São Mateus do Maranhão, Brazil, is 12h and 1min.
On the first day of April in São Mateus do Maranhão, sunrise is at 05:59 and sunset at 18:03. On the last day of the month, sunrise is at 05:55 and sunset at 17:54 -03.

Sunshine

With an average of 5.6h of sunshine, April has the least sunshine of the year.

UV index

February through June and December, with an average maximum UV index of 6, are months with the lowest UV index in São Mateus do Maranhão. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In April, a daily UV index of 6 turns into the following recommendations:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. 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.