August weather forecast
São Luís, Brazil

August asserts itself as the driest month of the year in São Luís, with a mere 29mm (1.14") of rainfall. The gradual shift towards cooler temperatures, which began in July, continues into August. The month's 12 hours of daylight are complemented by a UV index of 11. August's weather highlights the peak of the dry season, marked by dramatic reductions in rainfall and a steady climate.

Temperature

The onset of August in São Luís, Brazil, notes an average high-temperature of a still hot 30.7°C (87.3°F), subtly shifted from July's 30.2°C (86.4°F). São Luís records an average nighttime low-temperature of 23°C (73.4°F) throughout August.

Heat index

For most parts of August, the heat index is appraised at a scorching 41°C (105.8°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
For clarity, heat index numbers account for light winds and areas under shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', stands as a testimony to how temperature and humidity combine to impact our sense of warmth. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Perspiring is a crucial mechanism for the human body, allowing it to release excessive warmth through evaporating sweat. In circumstances of high air temperature and humidity (high heat index), the body's perspiration is restricted, heightening the feeling of warmth. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

The average relative humidity in August is 84%.

Rainfall

In São Luís, in August, during 4 rainfall days, 29mm (1.14") of precipitation is typically accumulated. Throughout the year, there are 130 rainfall days, and 2290mm (90.16") of precipitation is accumulated.

Sea temperature

In São Luís, the average seawater temperature in August is 27.8°C (82°F).
Note: Water temperatures ranging between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, making swimming, diving, and similar water activities pleasurable for extended periods.

Daylight

The average length of the day in August in São Luís is 12h and 2min.
On the first day of the month, sunrise is at 06:03 and sunset at 18:03. On the last day of August, in São Luís, sunrise is at 05:55 and sunset at 17:59 -03.

Sunshine

August has the most sunshine of the year in São Luís, with an average of 8.4h of sunshine.

UV index

The average daily maximum UV index in August in São Luís is 11. A UV Index estimate of 11, and higher, represents an excessive health risk from exposure to the Sun's UV rays for average individuals.
Note: The maximum daily UV index of 11 in August interprets into the following recommendations:
Utilize all necessary safety measures, unprotected skin could suffer burns instantly. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Even on a cloudy day, sunscreen with a minimum SPF of 30 should be used liberally and reapplied often, especially after a swim or outdoor activity. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.