September weather forecast
Wempi, French Guiana

September highlights a significant shift in Wempi's weather with a rise in daytime temperature reaching a high point of 34.1°C (93.4°F). Rainfall and humidity greatly reduce during this period. As the rainy season fades away, the city begins to dry up. Sunrays are more direct and the weather becomes generally more conducive for outdoor activities, in spite of the high temperatures.

Temperature

Wempi experiences an average high-temperature of a still hot 34.1°C (93.4°F) in September, marking an insignificant shift from 32.8°C (91°F) in August. In stark contrast to the day's heat, the temperature dips to an average of 20.5°C (68.9°F) during September nights.

Heat index

September's average heat index is appraised at a burning hot 49°C (120.2°F). Take caution: Heat exhaustion and heat cramps are probable. Heatstroke may be imminent with ongoing effort.
Keep in mind the heat index values are meant for areas in shade and with light wind. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', represents the fusion of temperature and moisture in the air to suggest how warm it feels. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Wempi, in September, during 14.3 rainfall days, 36mm (1.42") of precipitation is typically accumulated. Throughout the year, there are 265.5 rainfall days, and 1078mm (42.44") of precipitation is accumulated.

Daylight

In Wempi, the average length of the day in September is 12h and 8min.
On the first day of the month, sunrise is at 06:30 and sunset at 18:40. On the last day of September, sunrise is at 06:22 and sunset at 18:28 -03.

Sunshine

September and October, with an average of 8.8h of sunshine, are months with the most sunshine.

UV index

The months with the highest UV index are August through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, a daily UV index of 7 turns into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. 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. During bright days, sunglasses that offer UVA and UVB defense are recommended.