April weather forecast
Calamba, Philippines

April, the same as March, in Calamba, Philippines, is a hot spring month, with an average temperature ranging between max 31.8°C (89.2°F) and min 24°C (75.2°F).

Temperature

April's commencement is accompanied by an average high-temperature of a still tropical 31.8°C (89.2°F), diverging marginally from March's 30.1°C (86.2°F). In Calamba, the expected average low-temperature for April is a moderately hot 24°C (75.2°F).

Heat index

In April, the average heat index is calculated to be a blisteringly hot 42°C (107.6°F). Exercise heightened safety, heat cramps and heat exhaustion are probable. Persistent activity may provoke heatstroke.
The heat index's values are generally associated with conditions in shade and light breezes. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', is a single figure representing how weather conditions feel when combining temperature and humidity. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Rising body temperatures resulting from an imbalance in heat absorption can lead to potential thermal issues.

Humidity

With an average relative humidity of 75%, April is the least humid month in Calamba, Philippines.

Rainfall

In Calamba, in April, it is raining for 13.4 days, with typically 18mm (0.71") of accumulated precipitation. In Calamba, during the entire year, the rain falls for 216.4 days and collects up to 476mm (18.74") of precipitation.

Daylight

In April, the average length of the day in Calamba is 12h and 27min.
On the first day of the month, sunrise is at 5:51 am and sunset at 6:07 pm. On the last day of April, sunrise is at 5:33 am and sunset at 6:11 pm PST.

Sunshine

April has the most sunshine of the year, with an average of 11.1h of sunshine.

UV index

The months with the highest UV index are February through July, September and November, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: A typical high UV index of 7 in April suggests the following recommendations:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.