September weather forecast
Shanwei, China

September in Shanwei marks a gradual descent from the summer high, entering the beginning of autumn. Rainfall levels recede to 173mm (6.81"), characterizing a notable drop from the previously recorded highs, suggesting the city’s march away from the wet season. The sea temperature, though still quite high, subtly hints at a cooling trend. Meanwhile, daylight hours continue to contract, dims the city's bright summer ambience. Needless to say, September's weather tells a story of a transitioning Shanwei, slowly shaking off summer's grip.

Temperature

The transition from August to September in Shanwei sees average high-temperatures adjusting to a still tropical 30.6°C (87.1°F), from a not significantly different 30.9°C (87.6°F). Shanwei's average low-temperature in the month of September is recorded at a warm 24.3°C (75.7°F).

Heat index

The average heat index in September is evaluated at a fiery hot 39°C (102.2°F). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. As the body accumulates more heat than it can release, body temperature goes up, increasing the risk of heat-related health issues.

Humidity

The average relative humidity in September is 79%.

Rainfall

In Shanwei, China, in September, it is raining for 11.2 days, with typically 173mm (6.81") of accumulated precipitation. In Shanwei, during the entire year, the rain falls for 129 days and collects up to 1947mm (76.65") of precipitation.

Sea temperature

In Shanwei, China, the average seawater temperature in September is 28.1°C (82.6°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for swimming, diving, and other activities, ensuring comfort and enjoyment for lengthened periods.

Daylight

The average length of the day in September is 12h and 17min.
On the first day of September in Shanwei, China, sunrise is at 06:01 and sunset at 18:35. On the last day of the month, sunrise is at 06:09 and sunset at 18:07 CST.

Sunshine

In Shanwei, the average sunshine in September is 6.4h.