September weather forecast
Gaillot, French Guiana

September

Weather in September

The first month of the autumn, September, is also a hot month in Gaillot, French Guiana, with an average temperature ranging between min 22.5°C (72.5°F) and max 32.7°C (90.9°F).

Temperature

September's average high-temperature is a still tropical 32.7°C (90.9°F), maintaining a close comparison with August's 32°C (89.6°F). During September, Gaillot experiences an average low-temperature of 22.5°C (72.5°F) at night.

Heat index

The heat index in September is evaluated at a blazing hot 47°C (116.6°F). Stay alert: Heat cramps and heat exhaustion are expected. Heatstroke is a likely outcome of ongoing activity.
Note that heat index values are valued for light wind and location in the shade. Facing direct sunlight may hike up the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', melds the effects of warmth and moisture to generate a feeling of heat. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. With direct sunlight, be aware that it might enhance the heat sensation, raising the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.

Humidity

The average relative humidity in September is 79%.

Rainfall

In September, the rain falls for 11.5 days. Throughout September, 26mm (1.02") of precipitation is accumulated. Throughout the year, in Gaillot, French Guiana, there are 253 rainfall days, and 878mm (34.57") of precipitation is accumulated.

Daylight

In Gaillot, French Guiana, the average length of the day in September is 12h and 9min.
On the first day of the month, sunrise is at 06:28 and sunset at 18:40. On the last day of September, in Gaillot, French Guiana, sunrise is at 06:22 and sunset at 18:26 -03.

Sunshine

The month with the most sunshine in Gaillot is September, with an average of 9.1h of sunshine.

UV index

The months with the highest UV index in Gaillot are July through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. 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. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.

Frequently asked questions

How hot is it in Gaillot in September?
September temperatures vary between a high-temperature of 32.7°C (90.9°F) and a low-temperature of 22.5°C (72.5°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in September is evaluated at 47°C (116.6°F).
What is the average humidity in September in Gaillot?
In Gaillot, the average relative humidity in September is 79%.
How much does it rain in Gaillot in September?
In Gaillot, French Guiana, in September, it is raining for 11.5 days, with typically 26mm (1.02") of accumulated precipitation.
What is the average length of the day in September in Gaillot?
In Gaillot, French Guiana, the average day length in September is 12h and 9min.
What time are sunrise and sunset in September in Gaillot?
In September, on the first day of the month, sunrise is at 06:28 and sunset at 18:40. On the last day of the month, in Gaillot, French Guiana, sunrise is at 06:22 and sunset at 18:26 -03.
What month has the most sunshine in Gaillot?
September has the most sunshine of the year in Gaillot, with an average of 9.1h of sunshine.
How many hours of sunshine does Gaillot have in September?
In September, the average sunshine duration in Gaillot, French Guiana, is 9.1h.
What is the month with the highest UV index in Gaillot?
The months with the highest UV index are July through November, with an average maximum UV index of 7.
How high is the UV index in September in Gaillot?
In Gaillot, French Guiana, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September - Gaillot, French Guiana
Average temperature in September
Gaillot, French Guiana
  • Average high temperature in September: 32.7°C

The warmest month (with the highest average high temperature) is October (33.1°C).
The month with the lowest average high temperature is February (29.1°C).

  • Average low temperature in September: 22.5°C

The month with the highest average low temperature is May (23.3°C).
The coldest month (with the lowest average low temperature) is July (22.2°C).

Average pressure in September - Gaillot, French Guiana
Average pressure in September
Gaillot, French Guiana
  • Average pressure in September: 1011.6mbar

The months with the highest atmospheric pressure are June and July (1012.9mbar).
The month with the lowest atmospheric pressure is November (1009.5mbar).

Average wind speed in September - Gaillot, French Guiana
Average wind speed in September
Gaillot, French Guiana
  • Average wind speed in September: 7.7km/h

The windiest months (with the highest average wind speed) are February and March (9.5km/h).
The calmest month (with the lowest average wind speed) is July (6.4km/h).

Average humidity in September - Gaillot, French Guiana
Average humidity in September
Gaillot, French Guiana
  • Average humidity in September: 79%

The month with the highest relative humidity is June (88%).
The month with the lowest relative humidity is October (77%).

Average rainfall in September - Gaillot, French Guiana
Average rainfall in September
Gaillot, French Guiana
  • Average rainfall in September: 26mm

The wettest month (with the highest rainfall) is May (137mm).
The driest month (with the least rainfall) is October (23mm).

Average rainfall days in September - Gaillot, French Guiana
Average rainfall days in September
Gaillot, French Guiana
  • Average rainfall days in September: 11.5 days

The month with the highest number of rainy days is May (28 days).
The month with the least rainy days is September (11.5 days).

Average daylight in September / Average sunshine in September - Gaillot, French Guiana
Average daylight in September /
Average sunshine in September
Gaillot, French Guiana
  • Average daylight in September: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 24min).
The month with the shortest days is December (Average daylight: 11h and 48min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is September (Average sunshine: 9h and 6min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in September - Gaillot, French Guiana
Average sunshine days in September
Gaillot, French Guiana
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is October (16 days).
The month with the least sunshine days is May (1.8 days).

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

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

Average cloud cover in September - Gaillot, French Guiana
Average cloud cover in September
Gaillot, French Guiana
  • Average cloud cover in September: 34

The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 34).

Average visibility in September - Gaillot, French Guiana
Average visibility in September
Gaillot, French Guiana
  • Average visibility in September: 8km

The months with the highest visibility are February, March and April (9km).
The months with the lowest visibility are June, July and August (7km).

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