September weather forecast
Mana, French Guiana

Peak heat is expected in Mana in September, with temperatures soaring to a high of 32.7°C (90.9°F)—the hottest month of the year. A dip in the rainfall reading can make outdoor activities more appealing. Coastal winds maintain a steady pace, allowing for a pleasant evening by the water. However, the intensity of the heat steadily reduces as the city transitions to October. Despite the heat, it is still a good month to revel in the city's unique architecture and culinary delights.

Temperature

As August turns into September in Mana, the average high-temperatures rest at a still hot 32.7°C (90.9°F), showing a minor variation from the prior month. During the month of September, Mana anticipates a mean low-temperature of 22.5°C (72.5°F).

Heat index

In September, the average heat index is evaluated at a blazing hot 47°C (116.6°F). Mind: Heat cramps along with heat exhaustion are anticipated. Heatstroke can develop with continued physical activity.
Data suggests that the heat index is set for environments in shade and with a light wind. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
In response to overheating, the human body perspires to cool down, mainly through the evaporation of sweat. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In Mana, the average relative humidity in September is 79%.

Rainfall

In Mana, in September, during 11.5 rainfall days, 26mm (1.02") of precipitation is typically accumulated. In Mana, during the entire year, the rain falls for 253 days and collects up to 878mm (34.57") of precipitation.

Sea temperature

In September, the average sea temperature in Mana is 28.2°C (82.8°F).
Note: For activities in the water such as swimming or diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are considered optimal for prolonged enjoyment without discomfort.

Daylight

In September, the average length of the day is 12h and 9min.
On the first day of the month, sunrise is at 06:28 and sunset at 18:41. On the last day of September, in Mana, French Guiana, sunrise is at 06:22 and sunset at 18:27 -03.

Sunshine

With an average of 9.1h of sunshine, September has the most sunshine of the year in Mana.

UV index

July through November, with an average maximum UV index of 7, are months with the highest UV index in Mana. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily maximum UV index of 7 in September translates into the following instructions:
Resist extreme sun exposure. Guarding against solar damage is essential. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The mirror effect of sand and water ups the UV radiation strength.