September weather forecast
Fracas, French Guiana

The first month of the autumn, September, is still a hot month in Fracas, 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

The introduction of September notes a subtle temperature variation to a still tropical 32.7°C (90.9°F) from August's 32°C (89.6°F). During September, Fracas experiences a consistent low-temperature average of 22.5°C (72.5°F).

Heat index

The heat index value during September is calculated to be a blazing hot 47°C (116.6°F). Prudent: Heat cramps and heat exhaustion are likely. Heatstroke becomes imminent with sustained exertion.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Heat index values might soar by up to 15 Fahrenheit (8 Celsius) degrees with exposure to direct sunshine.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical 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.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via 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. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

The average relative humidity in September in Fracas is 79%.

Rainfall

In Fracas, during September, the rain falls for 11.5 days and regularly aggregates up to 26mm (1.02") of precipitation. Throughout the year, in Fracas, there are 253 rainfall days, and 878mm (34.57") of precipitation is accumulated.

Daylight

In Fracas, 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 18:40. On the last day of the month, sunrise is at 06:22 and sunset at 18:26 -03.

Sunshine

September has the most sunshine of the year, with an average of 9.1h of sunshine.

UV index

July through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: An average UV index of 7 in September transforms into this advice:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. 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. 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.