September weather forecast
Saï, French Guiana

September, the first month of the autumn in Saï, is also a hot month, with an average temperature varying between 34.1°C (93.4°F) and 20.5°C (68.9°F).

Temperature

The arrival of September brings an average high-temperature of a still tropical 34.1°C (93.4°F), nearly identical to August's 32.8°C (91°F). Saï sees a major change from daytime highs, with the nighttime temperature dipping to an agreeable 20.5°C (68.9°F) on average during September.

Heat index

September's average heat index is appraised at a blazing hot 49°C (120.2°F). Attention: Heat exhaustion and heat cramps are quite likely. Heatstroke becomes a risk with continued exertion.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the outcome of merging air's temperature and its humidity metrics. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the air contains significant moisture, the efficiency of the evaporation process decreases, preventing the body from cooling down effectively and creating a feeling of overheating. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Saï, during September, the rain falls for 14.3 days and regularly aggregates up to 36mm (1.42") of precipitation. Throughout the year, there are 265.5 rainfall days, and 1078mm (42.44") of precipitation is accumulated.

Daylight

In September, the average length of the day in Saï is 12h and 8min.
On the first day of September in Saï, sunrise is at 06:27 and sunset at 18:38. On the last day of the month, sunrise is at 06:20 and sunset at 18:25 -03.

Sunshine

The months with the most sunshine in Saï are September and October, with an average of 8.8h of sunshine.

UV index

August through November, with an average maximum UV index of 7, are months with the highest UV index in Saï. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: A daily maximum UV index of 7 in September translates into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.