September weather forecast
Grigel, French Guiana

The first month of the autumn, September, is still a hot month in Grigel, French Guiana, with an average temperature fluctuating between 20.5°C (68.9°F) and 34.1°C (93.4°F).

Temperature

September's average high-temperature is a still hot 34.1°C (93.4°F), maintaining a close comparison with August's 32.8°C (91°F). September, marked by an average low-temperature of 20.5°C (68.9°F), indicates a large temperature drop from the daytime peak.

Heat index

The heat index in September is computed to be a life-threatening hot 49°C (120.2°F). Take note: Heat exhaustion and heat cramps are expected. Heatstroke can occur with prolonged effort.
Heat index's context suggests values are appropriate for shady areas and slight breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an estimation of the warmth sensation when considering humidity levels. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Youngsters are usually more at risk than adults, considering they sweat less. Additionally, their high skin surface area compared to their little bodies and their high heat production due to activity increases their risk.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Grigel, French Guiana, the average relative humidity in September is 74%.

Rainfall

In Grigel, French Guiana, in September, during 14.3 rainfall days, 36mm (1.42") of precipitation is typically accumulated. In Grigel, French Guiana, during the entire year, the rain falls for 265.5 days and collects up to 1078mm (42.44") of precipitation.

Daylight

In Grigel, French Guiana, the average length of the day in September is 12h and 8min.
On the first day of September, sunrise is at 06:29 and sunset at 18:39. On the last day of the month, sunrise is at 06:21 and sunset at 18:27 -03.

Sunshine

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

UV index

The months with the highest UV index in Grigel are August through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: During September, 7 as the daily maximum UV index converts into the following advice:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.