September weather forecast
Îlet Lézard, French Guiana

The first month of the autumn, September, is still a tropical month in Îlet Lézard, French Guiana, with temperature in the range of an average low of 22.5°C (72.5°F) and an average high of 32.7°C (90.9°F).

Temperature

September records an average high-temperature of a still hot 32.7°C (90.9°F), indicating a minor variation from the preceding month. Îlet Lézard observes an average nighttime low-temperature of 22.5°C (72.5°F) during the month of September.

Heat index

The heat index value during September is calculated to be a burning hot 47°C (116.6°F). Keep wary: Heat cramps along with heat exhaustion are expected. Heatstroke is a possible outcome of ongoing activity.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a composite of temperature and humidity figures to convey how warm it feels. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children frequently underestimate the importance of resting and drinking fluids. Thirst is a symptom of advanced dehydration - hence the need to hydrate regularly, especially during protracted physical exercises.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. Under high air temperature and high humidity (high heat index) conditions, the body's ability to perspire is compromised, increasing the sensation of heat. 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

The average relative humidity in September in Îlet Lézard is 79%.

Rainfall

In Îlet Lézard, during September, the rain falls for 11.5 days and regularly aggregates up to 26mm (1.02") of precipitation. In Îlet Lézard, during the entire year, the rain falls for 253 days and collects up to 878mm (34.57") of precipitation.

Daylight

In September, the average length of the day in Îlet Lézard is 12h and 9min.
On the first day of the month, sunrise is at 06:28 and sunset at 18:41. On the last day of September, in Îlet Lézard, sunrise is at 06:22 and sunset at 18:27 -03.

Sunshine

With an average of 9.1h of sunshine, September has the most sunshine of the year in Îlet Lézard.

UV index

July through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, a daily maximum UV index of 7 leads to the following instructions:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.