September weather forecast
Bostok, French Guiana

As Bostok progresses into September, the weather pattern shifts further. This transition to drier weather is sustained as September builds upon the trends of the previous month. As we approach the end of the monsoon season, the weather stabilizes, maintaining the consistency we have come to expect from Bostok's climate.

Temperature

The transition from August to September sees an average high-temperature of a still tropical 34.1°C (93.4°F), indicating a minor variance from the prior month. Bostok's September nights bring a significant temperature shift, averaging at an agreeable 20.5°C (68.9°F).

Heat index

The heat index value for September is computed to be a blazing hot 49°C (120.2°F). Mindful: Heat cramps and heat exhaustion are to be expected. Extended physical effort might result in heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. Direct sunlight might lead to a heat index increase by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In Bostok, the average relative humidity in September is 74%.

Rainfall

In Bostok, 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 Bostok, 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 18:41. On the last day of September, in Bostok, 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 in Bostok.

UV index

The months with the highest UV index 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 rays for the ordinary person.
Note: A typical high UV index of 7 in September suggests the following recommendations:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.