September weather forecast
Mariveles, Philippines

September, the first month of the autumn in Mariveles, is still a warm month, with an average temperature fluctuating between 29.1°C (84.4°F) and 25.5°C (77.9°F).

Temperature

With the advent of September, Mariveles's high-temperatures adjust to a still warm 29.1°C (84.4°F), closely aligning with the preceding month. Mariveles encounters a small divergence from daytime high temperatures, averaging a low-temperature of 25.5°C (77.9°F) during September nights.

Heat index

The heat index value for September is calculated to be a torrid 36°C (96.8°F). Undertake extra safety actions, heat cramps and heat exhaustion are expected. Heatstroke may result from lengthy activity.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Heat index values may be hiked up by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. 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.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. With higher relative humidity, the rate of evaporation is reduced, resulting in increased heat retention in the body compared to drier air. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

The months with the highest humidity in Mariveles are August and September, with an average relative humidity of 83%.

Rainfall

In Mariveles, in September, during 26.8 rainfall days, 206mm (8.11") of precipitation is typically accumulated. In Mariveles, during the entire year, the rain falls for 206.5 days and collects up to 1288mm (50.71") of precipitation.

Sea temperature

In Mariveles, the average seawater temperature in September is 28.4°C (83.1°F).
Note: Water temperatures from 25°C (77°F) to 29°C (84.2°F) make swimming, diving, and similar activities highly pleasurable and enjoyable for long periods without discomfort.

Daylight

In September, the average length of the day is 12h and 13min.
On the first day of the month, sunrise is at 5:46 am and sunset at 6:10 pm. On the last day of September, sunrise is at 5:47 am and sunset at 5:48 pm PST.

Sunshine

The average sunshine in September is 7.7h.

UV index

January through June, August through December, with an average maximum UV index of 7, are months with the highest UV index in Mariveles. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 7 in September translates into this advice:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be wary! Reflections from sand and water make UV radiation more intense.