September weather forecast
Heyuan, China

September brings the beginning of fall to Heyuan, lending the city a crisp yet mild touch. This month is characteristically cooler, with a noticeable decline in temperature from the heavy August heat. The duration of daylight shortens in September, introducing longer evenings. Heyuan maintains a consistent visibility of 8km (5mi) throughout, scores perfect for the city's blooming nightlife. Gradually, the leaves begin to change color, indicating the city's transition towards cooler temperatures in the upcoming months.

Temperature

An average high-temperature of a still tropical 30.5°C (86.9°F) marks September, exhibiting a close resemblance to the conditions in August. Throughout the month of September, Heyuan observes an average nighttime temperature of 22°C (71.6°F).

Heat index

The heat index value for September is estimated at a scorching 40°C (104°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'feels like' or 'real feel', reflects the feeling of heat when considering both air temperature and humidity. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for 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.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In September, the average relative humidity in Heyuan is 82%.

Rainfall

In Heyuan, during September, the rain falls for 22 days and regularly aggregates up to 117mm (4.61") of precipitation. In Heyuan, during the entire year, the rain falls for 221.7 days and collects up to 1180mm (46.46") of precipitation.

Snowfall

February through December are months without snowfall.

Daylight

The average length of the day in September in Heyuan is 12h and 17min.
On the first day of September in Heyuan, sunrise is at 06:03 and sunset at 18:39. On the last day of the month, sunrise is at 06:12 and sunset at 18:09 CST.

Sunshine

In Heyuan, the average sunshine in September is 7.9h.

UV index

In Heyuan, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. During bright days, sunglasses that offer UVA and UVB defense are recommended.