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's September reports an average high-temperature of a still hot 34.1°C (93.4°F), exhibiting a minor difference from August. Nighttime temperatures throughout September in Wempi register a significant deviation from the day's highs, averaging at a pleasant 20.5°C (68.9°F).

Heat index

For September, the heat index is computed to be a blazing hot 49°C (120.2°F). Be wary: Heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. In high relative humidity, the body's ability to evaporate heat is diminished, resulting in a heightened feeling of warmth. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

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. In Wempi, during the entire year, the rain falls for 265.5 days and collects up to 1078mm (42.44") of precipitation.

Daylight

In September, the average length of the day 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 in Wempi.

UV index

The months with the highest UV index are August through November, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 7 in September interprets into the following advice:
Fend off overexposure. Sun protection is vital. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.