September weather forecast
Sienna, Philippines

September, the first month of the autumn in Sienna, is still a hot month, with an average temperature fluctuating between 24.8°C (76.6°F) and 30.5°C (86.9°F).

Temperature

The transition from August to September sees an average high-temperature of a still tropical 30.5°C (86.9°F), indicating a minor variance from the prior month. During the nights in September, Sienna observes an average low-temperature of 24.8°C (76.6°F).

Heat index

Throughout September, the heat index is evaluated at an extremely hot 40°C (104°F). Emphasize additional safety, risk of heat cramps and heat exhaustion is high. Continuous activity might result in heatstroke.
Research indicates the heat index considers values in shaded locales and with light winds. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. 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 hold great significance to children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. If heat absorption exceeds the body's cooling ability, body temperature can elevate, resulting in potential thermal illnesses.

Humidity

August and September, with an average relative humidity of 81%, are the most humid months in Sienna.

Rainfall

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

Daylight

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

Sunshine

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

UV index

The months with the highest UV index in Sienna, Philippines, are February through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum UV index of 7 during September translates into these guidelines:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.