September weather forecast
Farnous, French Guiana

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Weather in September

Weather conditions take a turn in September as there is a drop in temperature to 31.5°C (88.7°F) from 31.6°C (88.9°F) in August. This is accompanied by a relative increase in rainfall, though still maintaining lower rainfall numbers at 23mm (0.91"). Farnous posts the lowest cloud coverage at 25%, indicating clearer skies. The wind speeds gain momentum, translating to an average speed of 11.1km/h (6.9mph). As October approaches, residents can expect to see a slight increase in rainfall levels along with more cloud cover.

Temperature

With September's arrival, Farnous notes an average high-temperature of a still tropical 31.5°C (88.7°F), closely following the trend of the preceding month. The nighttime temperature dips to a warm 24.5°C (76.1°F) on average during September.

Heat index

The average heat index in September is appraised at a blisteringly hot 41°C (105.8°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
The body's inherent cooling system operates through perspiration, wherein evaporating sweat offsets excessive heat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

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

Rainfall

The month with the least rainfall in Farnous is September, when the rain falls for 12.2 days and typically collects 23mm (0.91") of precipitation.

Daylight

In Farnous, the average length of the day in September is 12h and 8min.
On the first day of the month, sunrise is at 06:23 and sunset at 18:35. On the last day of September, sunrise is at 06:17 and sunset at 18:21 -03.

Sunshine

The month with the most sunshine in Farnous, French Guiana, is September, with an average of 9.2h of sunshine.

UV index

The months with the highest UV index are June through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Fend off overexposure. Sun protection is vital. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.

Frequently asked questions

How hot does it get in Farnous in September?

In Farnous, in September, the average high-temperature is 31.5°C (88.7°F), and the average low-temperature is 24.5°C (76.1°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in September is appraised at 41°C (105.8°F).

What is the least humid month in Farnous?

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

What is the average humidity in September in Farnous?

In September, the average relative humidity is 76%.

What is the driest month in Farnous?

The month with the least rainfall in Farnous is September, when the rain falls for 12.2 days and typically collects 23mm (0.91") of precipitation.

How many days does it rain in September in Farnous?

In September, the rain falls for 12.2 days. Throughout September, 23mm (0.91") of precipitation is accumulated.

What is the average length of the day in September in Farnous?

In September, the average day length in Farnous, French Guiana, is 12h and 8min.

What time are sunrise and sunset in September in Farnous?

In September, on the first day of the month, sunrise is at 06:23 and sunset at 18:35. On the last day of the month, in Farnous, sunrise is at 06:17 and sunset at 18:21 -03.

What month has the most sunshine in Farnous?

The month with the most sunshine in Farnous, French Guiana, is September, with an average of 9.2h of sunshine.

How long on average sun shines in September in Farnous?

In September, the average sunshine duration is 9.2h.

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

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

How high is the UV index in September in Farnous?

In September, the average daily maximum UV index in Farnous, French Guiana, is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.

Average temperature in September
Farnous, French Guiana

Average temperature in September - Farnous, French Guiana
  • Average high temperature in September: 31.5°C

The warmest month (with the highest average high temperature) is October (31.6°C).
The month with the lowest average high temperature is February (27.7°C).

  • Average low temperature in September: 24.5°C

The months with the highest average low temperature are October and November (24.8°C).
The coldest months (with the lowest average low temperature) are June and July (23.8°C).

Average pressure in September
Farnous, French Guiana

Average pressure in September - Farnous, French Guiana
  • Average pressure in September: 1012mbar

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

Average wind speed in September
Farnous, French Guiana

Average wind speed in September - Farnous, French Guiana
  • Average wind speed in September: 11.1km/h

The windiest month (with the highest average wind speed) is February (12.9km/h).
The calmest month (with the lowest average wind speed) is July (8.3km/h).

Average humidity in September
Farnous, French Guiana

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

The month with the highest relative humidity is May (86%).
The months with the lowest relative humidity are September and October (76%).

Average rainfall in September
Farnous, French Guiana

Average rainfall in September - Farnous, French Guiana
  • Average rainfall in September: 23mm

The wettest month (with the highest rainfall) is May (293mm).
The driest month (with the least rainfall) is September (23mm).

Average rainfall days in September
Farnous, French Guiana

Average rainfall days in September - Farnous, French Guiana
  • Average rainfall days in September: 12.2 days

The month with the highest number of rainy days is May (28.9 days).
The month with the least rainy days is October (11.6 days).

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

Average daylight in September / Average sunshine in September - Farnous, 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 12min).
The month with the least sunshine is February (Average sunshine: 5h and 36min).

Average sunshine days in September
Farnous, French Guiana

Average sunshine days in September - Farnous, French Guiana
  • Average sunshine days in September: 13.6 days

The month with the most sunshine days is October (16.5 days).
The month with the least sunshine days is June (0.9 days).

Average UV index in September
Farnous, French Guiana

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

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

Average cloud cover in September
Farnous, French Guiana

Average cloud cover in September - Farnous, French Guiana
  • Average cloud cover in September: 25

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 25).

Average visibility in September
Farnous, French Guiana

Average visibility in September - Farnous, French Guiana
  • Average visibility in September: 10km

The months with the highest visibility are January, February, March, August, September, October and November (10km).
The months with the lowest visibility are April, May, June, July and December (9km).

Farnous, French Guiana

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