September weather forecast
San Guillermo, Philippines

The first month of the autumn, September, is also a hot month in San Guillermo, Philippines, with temperature in the range of an average low of 21.8°C (71.2°F) and an average high of 30.5°C (86.9°F).

Temperature

With the onset of September, the average high-temperature stands at a still hot 30.5°C (86.9°F), closely aligned with August's 31.1°C (88°F). San Guillermo experiences a consistent average temperature of 21.8°C (71.2°F) throughout the nights in September.

Heat index

The heat index in September is appraised at an extremely hot 40°C (104°F). Take more safety measures, heat exhaustion and heat cramps are potential outcomes. Persistent activity might lead to heatstroke.
Regarding the heat index, one should be aware it's determined by shaded settings and mild winds. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', is a numerical representation of warmth when taking temperature and moisture levels into account. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Understand that direct sun rays can influence the weather's impact, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones often do not realize the necessity to rest and replenish their fluids. Thirst is a delayed indication of dehydration - keeping hydrated, particularly in prolonged physical activity, is crucial.
The natural cooling mechanism in humans involves perspiration, where the evaporation of sweat balances out excessive warmth. With excessive moisture in the atmosphere, the effectiveness of the evaporation process is decreased, causing the body to cool down less efficiently, leading to a sensation of overheating. When the body is unable to balance heat gain, its temperature elevates, which may induce thermal illnesses.

Humidity

In September, the average relative humidity is 83%.

Rainfall

In September, the rain falls for 24.1 days. Throughout September, 92mm (3.62") of precipitation is accumulated. In San Guillermo, during the entire year, the rain falls for 222.7 days and collects up to 872mm (34.33") of precipitation.

Daylight

The average length of the day in September in San Guillermo, Philippines, is 12h and 14min.
On the first day of the month, sunrise is at 5:38 am and sunset at 6:05 pm. On the last day of September, sunrise is at 5:42 am and sunset at 5:42 pm PST.

Sunshine

The average sunshine in September in San Guillermo is 9.3h.

UV index

April through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index of 7 in September interprets into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.