Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
September and October are characterised by peak temperatures, with an average high of 30.9°C (87.6°F).Heat index
The heat index value for September is estimated at a blistering 40°C (104°F). Take more preventive steps, risk of heat exhaustion and heat cramps is elevated. Long activity may culminate in heatstroke.Heat index guidelines indicate values are for light wind scenarios and shaded regions. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is a fusion of air temperature and moisture levels to demonstrate the sensation of heat. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Direct exposure to sun rays can potentially augment the heat sensation, elevating the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When the level of relative humidity is elevated, evaporation diminishes, causing more warmth to be retained in the body than in dry air. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.
Humidity
The months with the lowest humidity are September and October, with an average relative humidity of 77%.Rainfall
September is the month with the least rainfall in Perdu Temps. Rain falls for 14.3 days and accumulates 29mm (1.14") of precipitation.Daylight
The average length of the day in September in Perdu Temps is 12h and 8min.On the first day of September in Perdu Temps, French Guiana, sunrise is at 06:27 and sunset at 18:39. On the last day of the month, sunrise is at 06:20 and sunset at 18:25 -03.
Sunshine
With an average of 9.3h of sunshine, September has the most sunshine of the year.UV index
The months with the highest UV index in Perdu Temps are July through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for the ordinary person.Note: A maximum high UV index of 7 in September translates into the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the warmest months in Perdu Temps?
How hot is September in Perdu Temps?
What is the least humid month in Perdu Temps?
What is the average humidity in September in Perdu Temps?
What is the driest month in Perdu Temps?
How many days does it rain in September in Perdu Temps?
What is the average length of the day in September in Perdu Temps?
When is the sunrise / sunset in September in Perdu Temps?
What month has the most sunshine in Perdu Temps?
How long on average sun shines in September in Perdu Temps?
When is the highest UV index in Perdu Temps?
What is the UV index reading in September in Perdu Temps?
Average temperature in September
Perdu Temps, French Guiana
- Average high temperature in September: 30.9°C
The warmest months (with the highest average high temperature) are September and October (30.9°C).
The month with the lowest average high temperature is February (27.5°C).
- Average low temperature in September: 24.8°C
The month with the highest average low temperature is November (25.1°C).
The coldest month (with the lowest average low temperature) is January (24.2°C).
Average pressure in September
Perdu Temps, French Guiana
- Average pressure in September: 1012mbar
The months with the highest atmospheric pressure are June and July (1013.1mbar).
The month with the lowest atmospheric pressure is November (1009.7mbar).
Average wind speed in September
Perdu Temps, French Guiana
- Average wind speed in September: 12.7km/h
The windiest month (with the highest average wind speed) is February (15.3km/h).
The calmest month (with the lowest average wind speed) is July (9.7km/h).
Average humidity in September
Perdu Temps, French Guiana
- Average humidity in September: 77%
The months with the highest relative humidity are February and May (84%).
The months with the lowest relative humidity are September and October (77%).
Average rainfall in September
Perdu Temps, French Guiana
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is May (279mm).
The driest month (with the least rainfall) is September (29mm).
Average rainfall days in September
Perdu Temps, French Guiana
- Average rainfall days in September: 14.3 days
The month with the highest number of rainy days is May (29.6 days).
The months with the least rainy days are September and October (14.3 days).
Average daylight in September /
Average sunshine in September
Perdu Temps, 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 2min
The month with the most sunshine is September (Average sunshine: 9h and 18min).
The month with the least sunshine is February (Average sunshine: 5h and 48min).
Average sunshine days in September
Perdu Temps, French Guiana
- Average sunshine days in September: 11.6 days
The month with the most sunshine days is October (13.2 days).
The month with the least sunshine days is May (0.6 days).
Average UV index in September
Perdu Temps, 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
Perdu Temps, French Guiana
- Average cloud cover in September: 25
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 25).
Average visibility in September
Perdu Temps, French Guiana
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, August, September, October, November and December (10km).
The months with the lowest visibility are May, June and July (9km).
