September weather forecast
São Luís de Montes Belos, Brazil

September, the first month of the spring in São Luís de Montes Belos, is still a tropical month, with temperature in the range of an average high of 34.1°C (93.4°F) and an average low of 21°C (69.8°F).

Temperature

With an average high-temperature of 34.1°C (93.4°F) and an average low-temperature of 21°C (69.8°F), September is the warmest month.

Heat index

September's mean heat index is estimated at a very hot 36°C (96.8°F). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
Heat index specifics point out values are for conditions of shade and a slight breeze. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Keep aware, the sun, when shining directly, can intensify the heat experience, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

The average relative humidity in September is 40%.

Rainfall

In São Luís de Montes Belos, in September, during 6.1 rainfall days, 16mm (0.63") of precipitation is typically accumulated. In São Luís de Montes Belos, during the entire year, the rain falls for 205.3 days and collects up to 1139mm (44.84") of precipitation.

Daylight

In São Luís de Montes Belos, the average length of the day in September is 12h and 1min.
On the first day of the month, sunrise is at 06:27 and sunset at 18:15. On the last day of September, in São Luís de Montes Belos, sunrise is at 06:03 and sunset at 18:18 -03.

Sunshine

In São Luís de Montes Belos, the average sunshine in September is 9.7h.

UV index

August and September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily high UV index of 7 during September translates into the following recommendations:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.