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 is marked by an average high-temperature of a still hot 30°C (86°F), almost identical to the preceding month. Nights in Kei Lun Wai during September maintain a steady temperature, averaging at a moderately hot 26.4°C (79.5°F).Heat index
For most parts of September, the heat index is evaluated at a very hot 37°C (98.6°F). Implement additional safety measures to avoid heat cramps and heat exhaustion. Persistent activity might trigger heatstroke.Heat index specifics point out values are for conditions of shade and a slight breeze. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
The physiological way the human body responds to excessive heat is by inducing perspiration, using sweat evaporation as a cooling mechanism. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.
Humidity
In September, the average relative humidity is 76%.Rainfall
In Kei Lun Wai, Hong Kong, during September, the rain falls for 22.7 days and regularly aggregates up to 150mm (5.91") of precipitation. Throughout the year, there are 207.6 rainfall days, and 1194mm (47.01") of precipitation is accumulated.Daylight
In September, the average length of the day in Kei Lun Wai is 12h and 17min.On the first day of September in Kei Lun Wai, sunrise is at 06:06 and sunset at 18:41. On the last day of the month, sunrise is at 06:15 and sunset at 18:12 HKT.
Sunshine
The average sunshine in September in Kei Lun Wai is 8.2h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the UV index of 7 transforms into the following advice:
Resist overexposure. Safeguarding from solar damage is indispensable. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is September in Kei Lun Wai?
What is the average humidity in September in Kei Lun Wai?
How many days does it rain in September in Kei Lun Wai?
What is the average length of the day in September in Kei Lun Wai?
When are sunrise and sunset in September in Kei Lun Wai?
How many hours of sunshine does Kei Lun Wai have in September?
What is the month with the highest UV index in Kei Lun Wai?
What is the UV index intensity in September in Kei Lun Wai?
Average temperature in September
Kei Lun Wai, Hong Kong
- Average high temperature in September: 30°C
The warmest month (with the highest average high temperature) is August (31.3°C).
The month with the lowest average high temperature is January (18.8°C).
- Average low temperature in September: 26.4°C
The months with the highest average low temperature are July and August (27.3°C).
The coldest month (with the lowest average low temperature) is January (14.6°C).
Average pressure in September
Kei Lun Wai, Hong Kong
- Average pressure in September: 1008.4mbar
The month with the highest atmospheric pressure is January (1020.4mbar).
The month with the lowest atmospheric pressure is August (1004.7mbar).
Average wind speed in September
Kei Lun Wai, Hong Kong
- Average wind speed in September: 12.1km/h
The windiest month (with the highest average wind speed) is December (14.2km/h).
The calmest month (with the lowest average wind speed) is August (11.8km/h).
Average humidity in September
Kei Lun Wai, Hong Kong
- Average humidity in September: 76%
The month with the highest relative humidity is May (83%).
The month with the lowest relative humidity is December (68%).
Average rainfall in September
Kei Lun Wai, Hong Kong
- Average rainfall in September: 150mm
The wettest month (with the highest rainfall) is August (215mm).
The driest month (with the least rainfall) is December (19mm).
Average rainfall days in September
Kei Lun Wai, Hong Kong
- Average rainfall days in September: 22.7 days
The month with the highest number of rainy days is July (25.3 days).
The month with the least rainy days is December (8.7 days).
Average daylight in September /
Average sunshine in September
Kei Lun Wai, Hong Kong
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 13h and 30min).
The month with the shortest days is December (Average daylight: 10h and 48min).
- Average sunshine in September: 8h and 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The months with the least sunshine are March and December (Average sunshine: 5h and 18min).
Average sunshine days in September
Kei Lun Wai, Hong Kong
- Average sunshine days in September: 5.8 days
The month with the most sunshine days is December (20.2 days).
The month with the least sunshine days is June (4.1 days).
Average UV index in September
Kei Lun Wai, Hong Kong
- Average UV index in September: 7
The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January and December (UV index 4).
Average cloud cover in September
Kei Lun Wai, Hong Kong
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 60).
The month with the least cloud cover is October (Cloud cover 36).
Average visibility in September
Kei Lun Wai, Hong Kong
- Average visibility in September: 10km
The months with the highest visibility are January, February, July, September, October, November and December (10km).
The months with the lowest visibility are March, April, May, June and August (9km).
