September weather forecast
Bienvenue, French Guiana

Weather in September

The first month of the autumn, September, is still a hot month in Bienvenue, French Guiana, with an average temperature ranging between min 21.8°C (71.2°F) and max 33.7°C (92.7°F).

Temperature

In Bienvenue, the average high-temperature in September is essentially the same as in August - a still tropical 33.7°C (92.7°F). In Bienvenue, the average low-temperature is 21.8°C (71.2°F).

Heat index

In September, the average heat index is evaluated at a life-threatening hot 49°C (120.2°F). Be wary: Heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, pregnancy), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial 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 is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In Bienvenue, the average relative humidity in September is 76%.

Rainfall

The month with the least rainfall is September, when the rain falls for 12.5 days and typically collects 21mm (0.83") of precipitation.

Daylight

In Bienvenue, the average length of the day in September is 12h and 8min.
On the first day of the month, sunrise is at 06:25 and sunset at 18:35. On the last day of September, sunrise is at 06:17 and sunset at 18:23 -03.

Sunshine

With an average of 8.8h of sunshine, September has the most sunshine of the year.

UV index

The months with the highest UV index in Bienvenue are August through October, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Bienvenue?

In September, in Bienvenue, the average high-temperature is 33.7°C (92.7°F), and the average low-temperature is 21.8°C (71.2°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in September is evaluated at 49°C (120.2°F).

What is the average humidity in September in Bienvenue?

In September, the average relative humidity in Bienvenue, French Guiana, is 76%.

What is the driest month in Bienvenue?

The month with the least rainfall in Bienvenue is September, when the rain falls for 12.5 days and typically collects 21mm (0.83") of precipitation.

How many days does it rain in September in Bienvenue?

In Bienvenue, French Guiana, in September, it is raining for 12.5 days, with typically 21mm (0.83") of accumulated precipitation.

How many hours of daylight does Bienvenue have in September?

The average day length in September in Bienvenue, French Guiana, is 12h and 8min.

When is the sunrise / sunset in September in Bienvenue?

On the first day of September, sunrise is at 06:25 and sunset at 18:35. On the last day of the month, sunrise is at 06:17 and sunset at 18:23 -03.

What month has the most sunshine in Bienvenue?

September has the most sunshine of the year in Bienvenue, French Guiana, with an average of 8.8h of sunshine.

How long on average sun shines in September in Bienvenue?

The average sunshine duration in September in Bienvenue is 8.8h.

What are the months with the highest UV index in Bienvenue?

The months with the highest UV index are August through October, with an average maximum UV index of 7.

How high is the UV index in September in Bienvenue?

The average daily maximum UV index in September in Bienvenue is 7. A UV Index reading of 6 to 7 represents a high health threat from exposure to Sun's UV rays.

Average temperature in September
Bienvenue, French Guiana

Average temperature in September - Bienvenue, French Guiana
  • Average high temperature in September: 33.7°C

The warmest month (with the highest average high temperature) is October (34.3°C).
The month with the lowest average high temperature is February (27.9°C).

  • Average low temperature in September: 21.8°C

The month with the highest average low temperature is April (22.4°C).
The coldest month (with the lowest average low temperature) is July (21.3°C).

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Average pressure in September
Bienvenue, French Guiana

Average pressure in September - Bienvenue, French Guiana
  • Average pressure in September: 1012.1mbar

The month with the highest atmospheric pressure is July (1013.2mbar).
The month with the lowest atmospheric pressure is November (1009.8mbar).

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Average wind speed in September
Bienvenue, French Guiana

Average wind speed in September - Bienvenue, French Guiana
  • Average wind speed in September: 6km/h

The windiest month (with the highest average wind speed) is October (6.1km/h).
The calmest month (with the lowest average wind speed) is June (4.2km/h).

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Average humidity in September
Bienvenue, French Guiana

Average humidity in September - Bienvenue, French Guiana
  • Average humidity in September: 76%

The month with the highest relative humidity is May (91%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in September
Bienvenue, French Guiana

Average rainfall in September - Bienvenue, French Guiana
  • Average rainfall in September: 21mm

The wettest month (with the highest rainfall) is May (195mm).
The driest month (with the least rainfall) is September (21mm).

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Average rainfall days in September
Bienvenue, French Guiana

Average rainfall days in September - Bienvenue, French Guiana
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (28.9 days).
The month with the least rainy days is October (12 days).

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Average daylight in September /
Average sunshine in September
Bienvenue, French Guiana

Average daylight in September / Average sunshine in September - Bienvenue, French Guiana
  • Average daylight in September: 12h and 8min

The month with the longest days is June (Average daylight: 12h and 18min).
The month with the shortest days is December (Average daylight: 11h and 57min).

  • Average sunshine in September: 8h and 48min

The month with the most sunshine is September (Average sunshine: 8h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).

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Average sunshine days in September
Bienvenue, French Guiana

Average sunshine days in September - Bienvenue, French Guiana
  • Average sunshine days in September: 13.5 days

The month with the most sunshine days is October (16.3 days).
The month with the least sunshine days is May (1.8 days).

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Average UV index in September
Bienvenue, French Guiana

Average UV index in September - Bienvenue, French Guiana
  • Average UV index in September: 7

The months with the highest UV index are August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, November and December (UV index 6).

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Average cloud cover in September
Bienvenue, French Guiana

Average cloud cover in September - Bienvenue, French Guiana
  • Average cloud cover in September: 48

The month with the most cloud cover is February (Cloud cover 78).
The month with the least cloud cover is October (Cloud cover 46).

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Average visibility in September
Bienvenue, French Guiana

Average visibility in September - Bienvenue, French Guiana
  • Average visibility in September: 7km

The months with the highest visibility are September and October (7km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (6km).

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