September weather forecast
Roura, French Guiana

September promises enchantingly clear skies in Roura, making it a firm favorite among locals and tourists alike. The transition to September involves a reduction in rainfall to an annual low of 23mm (0.91"). Clear skies and more sunshine make sightseeing a sheer joy in this month. It is also the beginning of a period when the wind speeds gradually increase. Octobers hails in with a slight increase in all parameters, including precipitation, temperature, and humidity.

Temperature

Entering September in Roura, the average high-temperature is recorded at a still hot 31.5°C (88.7°F), exhibiting a minimal shift from August's 30.9°C (87.6°F). An average low-temperature of 24.5°C (76.1°F) is noted during the nights in September.

Heat index

September's mean heat index is calculated to be a scorching 41°C (105.8°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. 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 derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely vital to babies and toddlers. Kids frequently ignore the importance of taking a break and rehydrating. Thirst is a late symptom of dehydration - thus, it is crucial to stay hydrated, especially during long-lasting physical activities.
The evaporation of sweat is a natural cooling mechanism of the human body, facilitated by perspiration. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

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

Rainfall

September is the month with the least rainfall. Rain falls for 12.2 days and accumulates 23mm (0.91") of precipitation.

Daylight

In Roura, the average length of the day in September is 12h and 8min.
On the first day of September, sunrise is at 06:23 and sunset at 18:35. On the last day of the month, sunrise is at 06:16 and sunset at 18:21 -03.

Sunshine

September has the most sunshine of the year in Roura, with an average of 9.2h of sunshine.

UV index

The months with the highest UV index in Roura, French Guiana, are June through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.
Note: In September, the UV index of 7 transforms into the following advice:
Resist extreme sun exposure. Guarding against solar damage is essential. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.