September weather forecast
Farnous, French Guiana

Weather conditions take a turn in September as there is a drop in temperature to 31.5°C (88.7°F) from 31.6°C (88.9°F) in August. This is accompanied by a relative increase in rainfall, though still maintaining lower rainfall numbers at 23mm (0.91"). Farnous posts the lowest cloud coverage at 25%, indicating clearer skies. The wind speeds gain momentum, translating to an average speed of 11.1km/h (6.9mph). As October approaches, residents can expect to see a slight increase in rainfall levels along with more cloud cover.

Temperature

With September's arrival, Farnous notes an average high-temperature of a still tropical 31.5°C (88.7°F), closely following the trend of the preceding month. The nighttime temperature dips to a warm 24.5°C (76.1°F) on average during September.

Heat index

The average heat index in September is appraised at a blisteringly hot 41°C (105.8°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

September and October, with an average relative humidity of 76%, are the least humid months in Farnous.

Rainfall

The month with the least rainfall in Farnous is September, when the rain falls for 12.2 days and typically collects 23mm (0.91") of precipitation.

Daylight

In Farnous, the average length of the day in September is 12h and 8min.
On the first day of the month, sunrise is at 06:23 and sunset at 18:35. On the last day of September, sunrise is at 06:17 and sunset at 18:21 -03.

Sunshine

The month with the most sunshine in Farnous, French Guiana, is September, with an average of 9.2h of sunshine.

UV index

The months with the highest UV index are June through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Fend off overexposure. Sun protection is vital. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.