September weather forecast
Gaillot, French Guiana

The first month of the autumn, September, is also a hot month in Gaillot, French Guiana, with an average temperature ranging between min 22.5°C (72.5°F) and max 32.7°C (90.9°F).

Temperature

September's average high-temperature is a still tropical 32.7°C (90.9°F), maintaining a close comparison with August's 32°C (89.6°F). During September, Gaillot experiences an average low-temperature of 22.5°C (72.5°F) at night.

Heat index

The heat index in September is evaluated at a blazing hot 47°C (116.6°F). Stay alert: Heat cramps and heat exhaustion are expected. Heatstroke is a likely outcome of ongoing activity.
Note that heat index values are valued for light wind and location in the shade. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', melds the effects of warmth and moisture to generate a feeling of heat. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 11.5 days. Throughout September, 26mm (1.02") of precipitation is accumulated. Throughout the year, in Gaillot, French Guiana, there are 253 rainfall days, and 878mm (34.57") of precipitation is accumulated.

Daylight

In Gaillot, French Guiana, the average length of the day in September is 12h and 9min.
On the first day of the month, sunrise is at 06:28 and sunset at 18:40. On the last day of September, in Gaillot, French Guiana, sunrise is at 06:22 and sunset at 18:26 -03.

Sunshine

The month with the most sunshine in Gaillot is September, with an average of 9.1h of sunshine.

UV index

The months with the highest UV index in Gaillot are July through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.