September weather forecast
Jordan Valley, Hong Kong

September, the first month of the autumn in Jordan Valley, is still a warm month, with an average temperature varying between 29.6°C (85.3°F) and 26.5°C (79.7°F).

Temperature

The onset of September manifests an average high-temperature of a warm 29.6°C (85.3°F), demonstrating a minor variation from the preceding month. Jordan Valley experiences a subtle drop in temperature during the September nights, recording an average of 26.5°C (79.7°F).

Heat index

September's heat index is computed to be a very hot 36°C (96.8°F). Implement heightened safety measures - risk of heat exhaustion and heat cramps is increased. Prolonged activity may result in heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', ties air temperature with relative humidity to produce the perceived temperature sensation. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are highly critical to babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. Accumulating more heat than the body can dissipate leads to an uptick in body temperature, with potential heat stress consequences.

Humidity

In Jordan Valley, Hong Kong, the average relative humidity in September is 77%.

Rainfall

In Jordan Valley, Hong Kong, in September, it is raining for 22.7 days, with typically 155mm (6.1") of accumulated precipitation. Throughout the year, there are 224.5 rainfall days, and 1264mm (49.76") of precipitation is accumulated.

Daylight

The average length of the day in September in Jordan Valley is 12h and 17min.
On the first day of the month, sunrise is at 06:05 and sunset at 18:40. On the last day of September, in Jordan Valley, sunrise is at 06:14 and sunset at 18:11 HKT.

Sunshine

In September, the average sunshine in Jordan Valley is 8.4h.

UV index

The months with the highest UV index are May through September, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Guard oneself from overexposure. Defence against sun injury is vital. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.