September weather forecast
Opoya, French Guiana

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

Temperature

The onset of September marks an average high-temperature of a still tropical 34.1°C (93.4°F), hardly differing from August's 32.8°C (91°F). A striking departure from daytime highs to an average low-temperature of 20.5°C (68.9°F) is witnessed in Opoya during September.

Heat index

The average heat index in September is evaluated at a burning hot 49°C (120.2°F). Attention: Heat exhaustion and heat cramps are quite likely. Heatstroke becomes a risk with continued exertion.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In September, the average relative humidity is 74%.

Rainfall

In Opoya, French Guiana, in September, it is raining for 14.3 days, with typically 36mm (1.42") of accumulated precipitation. In Opoya, during the entire year, the rain falls for 265.5 days and collects up to 1078mm (42.44") of precipitation.

Daylight

In September, the average length of the day in Opoya is 12h and 8min.
On the first day of the month, sunrise is at 06:30 and sunset at 18:41. On the last day of September, sunrise is at 06:23 and sunset at 18:28 -03.

Sunshine

The months with the most sunshine in Opoya 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 Opoya. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index of 7 during September translates into the following directions:
Guard oneself from overexposure. Defence against sun injury is vital. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Enhance your sun protection with tightly woven, yet airy clothing.