September weather forecast
Calasiao, Philippines

September, the first month of the autumn in Calasiao, is still a tropical month, with temperature in the range of an average high of 30.7°C (87.3°F) and an average low of 23.9°C (75°F).

Temperature

Calasiao's shift into September is marked by a subtle change to a still hot 30.7°C (87.3°F) from August's 30.5°C (86.9°F) in temperature. Calasiao reports an average nighttime low-temperature of 23.9°C (75°F) in September.

Heat index

The average heat index in September is estimated at a blisteringly hot 41°C (105.8°F). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
It is worth noting that heat index values are gauged for conditions in the shade and light breezes. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

With an average relative humidity of 83%, September is the most humid month in Calasiao.

Rainfall

In September, the rain falls for 25.1 days. Throughout September, 180mm (7.09") of precipitation is accumulated. In Calasiao, during the entire year, the rain falls for 187.6 days and collects up to 1079mm (42.48") of precipitation.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of the month, sunrise is at 5:45 am and sunset at 6:11 pm. On the last day of September, sunrise is at 5:48 am and sunset at 5:48 pm PST.

Sunshine

In September, the average sunshine in Calasiao is 9.2h.

UV index

The months with the highest UV index in Calasiao are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily high UV index of 7 in September translates into this advice:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Boost your sun resistance with garments that are densely woven yet spacious.