September weather forecast
Beihai, China

As Beihai bids farewell to summer, September ushers in a decreasing trend in temperature, rainfall, and humidity. From 283mm (11.14") in August, the precipitation drops significantly to 175mm (6.89"). The change in weather is a harbinger of the mild autumn months that lie ahead. The temperature of the sea begins its gradual decrease, although it remains inviting for swimming and other water sports. As September concludes, locals and visitors can anticipate a pleasant cooling trend in the ensuing months.

Temperature

Beihai records a slight change with September's average high-temperatures adjusting to a moderately hot 29.9°C (85.8°F) from August's 30.3°C (86.5°F). Beihai's nighttime temperature in September shows a minor descent, with a steady average of 26.7°C (80.1°F).

Heat index

The heat index in September is estimated at a sweltering 37°C (98.6°F). Exercise enhanced safety steps, heat cramps and heat exhaustion are probable. Heatstroke could be a result of sustained activity.
Observations indicate that the heat index values are for shady locations with light wind. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'feels like' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. One must note that being under the direct sun can escalate the heat's effects, with the heat index possibly rising by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to 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. Relative humidity in excess curtails evaporation, therefore reducing heat dissipation from the body, leading to feelings of excess heat. Excessive heat that's not properly managed leads to increased body temperatures and resultant health issues.

Humidity

In September, the average relative humidity in Beihai is 77%.

Rainfall

In Beihai, during September, the rain falls for 19.5 days and regularly aggregates up to 175mm (6.89") of precipitation. In Beihai, China, during the entire year, the rain falls for 201.9 days and collects up to 1262mm (49.69") of precipitation.

Sea temperature

In Beihai, the average seawater temperature in September is 29°C (84.2°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

In September, the average length of the day in Beihai is 12h and 16min.
On the first day of the month, sunrise is at 06:26 and sunset at 18:59. On the last day of September, sunrise is at 06:34 and sunset at 18:32 CST.

Sunshine

The month with the most sunshine in Beihai is September, with an average of 8.6h of sunshine.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Beihai. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 7 during September translates into these guidelines:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. 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. During bright days, sunglasses that offer UVA and UVB defense are recommended. Warning! The reflection of sand and water increases the UV dose.