September weather forecast
Jalbot, French Guiana

The first month of the autumn, September, is also a hot month in Jalbot, French Guiana, with an average temperature ranging between max 31.5°C (88.7°F) and min 24.5°C (76.1°F).

Temperature

September registers an average high-temperature of a still tropical 31.5°C (88.7°F), slightly varied from August's 30.9°C (87.6°F). In September, the nighttime temperature in Jalbot lowers to an average of 24.5°C (76.1°F).

Heat index

For most parts of September, the heat index is computed to be an extremely hot 41°C (105.8°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
The heat index's values are generally associated with conditions in shade and light breezes. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a single figure representing how weather conditions feel when combining temperature and humidity. The effect is experienced differently by individuals, hinging on unique characteristics such as body mass, stature, and level of activity. Consider the fact that direct sun exposure can influence how hot one feels, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. 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 physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Inadequate heat shedding in the face of rising body temperatures hints at potential dehydration risks.

Humidity

September and October, with an average relative humidity of 76%, are the least humid months.

Rainfall

The month with the least rainfall in Jalbot is September, when the rain falls for 12.2 days and typically collects 23mm (0.91") 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 06:24 and sunset at 18:36. On the last day of September, in Jalbot, French Guiana, sunrise is at 06:17 and sunset at 18:22 -03.

Sunshine

With an average of 9.2h of sunshine, September has the most sunshine of the year.

UV index

The months with the highest UV index in Jalbot, French Guiana, are June through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 7 translates into these guidelines:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. 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. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.