September weather forecast
Polémie, French Guiana

The first month of the autumn, September, is still a hot month in Polémie, French Guiana, with an average temperature fluctuating between 22.5°C (72.5°F) and 32.7°C (90.9°F).

Temperature

The commencement of September notes an average high-temperature of a still hot 32.7°C (90.9°F), exhibiting little difference from the previous month. Polémie, in September, witnesses an average low-temperature of 22.5°C (72.5°F).

Heat index

The average heat index in September is calculated to be a blazing hot 47°C (116.6°F). Guard: Heat exhaustion and heat cramps are foreseeable. Prolonged effort may bring about heatstroke.
The standards for the heat index are set for locations in shade and under light breezes. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. When air moisture content is high, the cooling process through evaporation is not as efficient, leading to an ineffective body cooling process and a feeling of overheating. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In September, the average relative humidity in Polémie is 79%.

Rainfall

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

Daylight

The average length of the day in September is 12h and 8min.
On the first day of September, sunrise is at 06:28 and sunset at 18:41. On the last day of the month, 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.

UV index

July through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum daily UV index of 7 during September morphs into the following directions:
Avoid overexposure. Fair-skinned individuals can burn in under 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.