April weather forecastSan Juan, Philippines

Weather in April

April in San Juan, Philippines, is a tropical spring month, with an average temperature fluctuating between 24.3°C (75.7°F) and 31.1°C (88°F).

Temperature

The advent of April presents an average high-temperature of a tropical 31.1°C (88°F), maintaining a close correlation with the preceding month. The average low-temperature, in April, is a moderately hot 24.3°C (75.7°F).

Heat index

April's average heat index is calculated to be a scorching 40°C (104°F). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. 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. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. When body heat isn't effectively managed, risks of dehydration and overheating amplify.

Humidity

April is the least humid month, with an average relative humidity of 76%.

Rainfall

In April, in San Juan, the rain falls for 12.7 days. Throughout April, 28mm (1.1") of precipitation is accumulated. In San Juan, during the entire year, the rain falls for 196.1 days and collects up to 602mm (23.7") of precipitation.

Daylight

The average length of the day in April is 12h and 28min.
On the first day of April in San Juan, sunrise is at 5:51 am and sunset at 6:08 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 6:12 pm PST.

Sunshine

With an average of 11.2h of sunshine, April has the most sunshine of the year in San Juan.

UV index

The months with the highest UV index in San Juan are February through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In April, the maximum UV index of 7 suggests this advice:
Deter overexposure. Protecting against the sun's effects is essential. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.