September weather forecast
Macau, China

September ushers in relief from the hot summer months. A noticeable reduction in humidity and rainfall compared to previous months hints at the start of the transitional phase towards autumn. Despite the slight drop in temperatures, the sea remains warm enough for swimmers and water sports enthusiasts. The change in weather prepares the landscape for the soothing autumn breeze.

Temperature

The shift into September finds Macau at an average high-temperature of a still tropical 30.4°C (86.7°F), closely comparable to August's conditions. September nights in Macau experience a consistent temperature drop to a moderately hot 25.1°C (77.2°F).

Heat index

The heat index in September is computed to be a torrid 38°C (100.4°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Given the heat index, its values are aligned with shaded sites and gentle winds. Direct exposure to sunlight could raise the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', gives an indication of how one might feel in terms of heat after considering humidity. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. 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. If the body retains more heat than it can expel, the increasing temperature can lead to heat-related conditions.

Humidity

In September, the average relative humidity is 77.9%.

Rainfall

In Macau, in September, it is raining for 12.3 days, with typically 220mm (8.66") of accumulated precipitation. In Macau, during the entire year, the rain falls for 130.2 days and collects up to 2058mm (81.02") of precipitation.

Sea temperature

In Macau, the average seawater temperature in September is 28.3°C (82.9°F).
Note: For any water activity, surface water temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed perfect and extremely pleasing for enduring enjoyment.

Daylight

In Macau, the average length of the day in September is 12h and 17min.
On the first day of September, sunrise is at 06:08 and sunset at 18:42. On the last day of the month, sunrise is at 06:16 and sunset at 18:14 CST.

Sunshine

In September, the average sunshine in Macau is 5.9h.

UV index

The average daily maximum UV index in September in Macau is 11. A UV Index reading of 11, and higher, represents an ultimate health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 11 in September interprets into the following advice:
Carry out all vital precautions. Protection from sun exposure is a must. 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. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Regardless of cloud cover, it's recommended to apply generously and reapply often a sunscreen with an SPF of at least 30, especially after swimming or any outdoor activity. Be attentive! The UV exposure is heightened with reflections from sand and water.