September weather forecast
Manila, Philippines

In September, the monsoon season in Manila starts to show signs of withdrawal, and a decline in the frequency of rainfall ensues. It is a month of transition with weather patterns fluctuating between the pending arrival of a drier spell and the departure of the wet season. The city’s overall climate, compared to August, experiences lower rainfall and minor changes in other parameters. September offers comparatively more sunshine hours than the gloomier month of August. Moving into October, the city observes a further decrease in rain, paving the way for the upcoming dry season.

Temperature

In the transition from August to September, Manila reports an average high-temperature of a still tropical 30.5°C (86.9°F), indicating a close resemblance to the prior month. Manila reports a consistent average low-temperature of 24.8°C (76.6°F) throughout September nights.

Heat index

In September, the heat index is appraised at a scorching 40°C (104°F). Adopt special protective actions against heat exhaustion and heat cramps. Long-duration activity risks heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', arises from combining readings of air temperature and relative moisture content. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it's vital to remain hydrated, particularly during prolonged physical activities.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The months with the highest humidity are August and September, with an average relative humidity of 81%.

Rainfall

In Manila, Philippines, in September, during 21 rainfall days, 128mm (5.04") of precipitation is typically accumulated. In Manila, Philippines, during the entire year, the rain falls for 185 days and collects up to 830mm (32.68") of precipitation.

Sea temperature

In Manila, the average seawater temperature in September is 28.7°C (83.7°F).
Note: Surface water temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are considered superb and highly pleasant for water activities over extended periods.

Daylight

In September, the average length of the day is 12h and 13min.
On the first day of September, sunrise is at 5:43 am and sunset at 6:08 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 5:46 pm PST.

Sunshine

In September, the average sunshine in Manila is 8.4h.

UV index

February through December, with an average maximum UV index of 7, are months with the highest UV index in Manila, Philippines. A UV Index of 6 to 7 symbolizes a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Deter overexposure. Protecting against the sun's effects is essential. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Stay vigilant! UV rays get a boost in intensity due to sand and water reflections.