September weather forecast
Calamba, Philippines

September, the first month of the autumn in Calamba, is also a moderately hot month, with temperature in the range of an average low of 24°C (75.2°F) and an average high of 29.7°C (85.5°F).

Temperature

With the onset of September, the average high-temperature stands at a still warm 29.7°C (85.5°F), closely aligned with August's 29.8°C (85.6°F). The nights of September in Calamba anticipate an average low-temperature of 24°C (75.2°F).

Heat index

For September, the heat index is calculated to be a fiery hot 38°C (100.4°F). Adopt extra preventive measures, the occurrence of heat cramps and heat exhaustion is likely. Heatstroke may follow extended activity.
Heat index evaluations are typically in the context of light winds and shaded environments. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', measures the perceived warmth when incorporating the humidity present in the air. The experience of temperature can be subjective, varying based on the individual's activity and heat perception, influenced by factors like wind, attire, and metabolic variations. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. Heat-related complications, like dehydration, can manifest if the body's heat gain exceeds its dissipation capacity.

Humidity

September is the most humid month, with an average relative humidity of 86%.

Rainfall

In Calamba, in September, during 22.7 rainfall days, 65mm (2.56") of precipitation is typically accumulated. In Calamba, during the entire year, the rain falls for 216.4 days and collects up to 476mm (18.74") of precipitation.

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 6:07 pm. On the last day of the month, sunrise is at 5:44 am and sunset at 5:45 pm PST.

Sunshine

The average sunshine in September in Calamba is 8.1h.

UV index

February through July, September and November, with an average maximum UV index of 7, are months with the highest UV index in Calamba, Philippines. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index, 7 during September, leads to the following recommendations:
Skirt overexposure. People with light complexions might get scorched in under 20 minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.