April weather forecast and climate
San Juan, PR

An old fort building and a view of the stunning San Juan city, Puerto Rico
An old fort building and a view of the stunning San Juan city, Puerto Rico

Weather in April

April, the same as March, is another warm spring month in San Juan, Puerto Rico, with average temperature varying between 75.2°F (24°C) and 81.1°F (27.3°C).

Temperature

In San Juan, the average high-temperature is relatively the same as in March - a still moderately hot 81.1°F (27.3°C). In San Juan, in April, the average low-temperature is 75.2°F (24°C).

Heat index

In April, the average heat index is appraised at a hot 86.2°F (30.1°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, differences in body mass, height, and shape, pregnancy, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in San Juan is 77%.

Rainfall

April is the month with the least rainfall in San Juan. Rain falls for 12.4 days and accumulates 0.55" (14mm) of precipitation.

Ocean temperature

In San Juan, the average seawater temperature in April is 80.4°F (26.9°C).
Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The average length of the day in San Juan is 12.6h.

Sunshine

In San Juan, the average sunshine in April is 9.1h.

UV index

Months with the highest UV index in San Juan, Puerto Rico, are April through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation for the average person.
Note: In April, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in April in San Juan?

In San Juan, Puerto Rico, in April, the average high-temperature is 81.1°F (27.3°C), and the average low-temperature is 75.2°F (24°C). In April, the average heat index (a.k.a. 'feels like', 'apparent temperature'), that represents influence of the relative humidity to air temperaure, is evaluated at 86.2°F (30.1°C).

What is the average humidity in April in San Juan?

In San Juan, the average relative humidity in April is 77%.

How many days does it rain in April in San Juan?

In April, in San Juan, Puerto Rico, the rain falls for 12.4 days. Throughout April, 0.55" (14mm) of precipitation is accumulated.

What is the driest month in San Juan?

April is the month with the least rainfall. Rain falls for 12.4 days and accumulates 0.55" (14mm) of precipitation.

What is the water temperature in April in San Juan?

In April, the average ocean temperature in San Juan is 80.4°F (26.9°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in April in San Juan?

The average length of the day in April in San Juan is 12.6h.

How long on average sun shines in April in San Juan?

In April, the average sunshine in San Juan, Puerto Rico, is 9.1h.

What are the months with the highest UV index in San Juan?

April through November, with an average maximum UV index of 7, are months with the highest UV index in San Juan.

What is the UV index intensity in April in San Juan?

In April, the average daily maximum UV index is 7. A UV Index value of 6 to 7 symbolizes a high health threat from unprotected exposure to the UV radiation.

Average temperature in April
San Juan, PR

Average temperature in April - San Juan, PR
  • Average high temperature in April: 81.1°F

The warmest month (with the highest average high temperature) is August (85.1°F).
Months with the lowest average high temperature are January and March (79.9°F).

  • Average low temperature in April: 75.2°F

Months with the highest average low temperature are August, September and October (79.2°F).
The coldest month (with the lowest average low temperature) is March (73.9°F).

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Average pressure in April
San Juan, PR

Average pressure in April - San Juan, PR
  • Average pressure in April: 29.99"

Months with the highest atmospheric pressure are January and February (30.02").
The month with the lowest atmospheric pressure is October (29.9").

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Average wind speed in April
San Juan, PR

Average wind speed in April - San Juan, PR
  • Average wind speed in April: 9.4mph

The windiest month (with the highest average wind speed) is July (10.7mph).
The calmest month (with the lowest average wind speed) is October (7.4mph).

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Average humidity in April
San Juan, PR

Average humidity in April - San Juan, PR
  • Average humidity in April: 77%

Months with the highest relative humidity are May, June and July (79%).
Months with the lowest relative humidity are February and March (76%).

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Average rainfall in April
San Juan, PR

Average rainfall in April - San Juan, PR
  • Average rainfall in April: 0.55"

The wettest month (with the highest rainfall) is November (1.57").
The driest month (with the least rainfall) is April (0.55").

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Average rainfall days in April
San Juan, PR

Average rainfall days in April - San Juan, PR
  • Average rainfall days in April: 12.4 days

The month with the highest number of rainy days is November (16.1 days).
The month with the least rainy days is June (10.3 days).

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Average sea temperature in April
San Juan, PR

Average sea temperature in April - San Juan, PR
  • Average sea temperature in April: 80.5°F

The best month for swimming (with the highest average sea temperature) is September (84.9°F).
The coldest month (with the lowest average sea temperature) is February (78.9°F).

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Average daylight in April /
Average sunshine in April
San Juan, PR

Average daylight in April / Average sunshine in April - San Juan, PR
  • Average daylight in April: 12.6h

The month with the longest days is June (Average daylight: 13.2h).
The month with the shortest days is December (Average daylight: 11h).

  • Average sunshine in April: 9.1h

The month with the most sunshine is June (Average sunshine: 10.9h).
The month with the least sunshine is December (Average sunshine: 6.6h).

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Average sunshine days in April
San Juan, PR

Average sunshine days in April - San Juan, PR
  • Average sunshine days in April: 11 days

The month with the most sunshine days is June (13.7 days).
The month with the least sunshine days is November (9.4 days).

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Average UV index in April
San Juan, PR

Average UV index in April - San Juan, PR
  • Average UV index in April: 7

Months with the highest UV index are April, May, June, July, August, September, October and November (UV index 7).
Months with the lowest UV index are January, February, March and December (UV index 6).

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Average cloud cover in April
San Juan, PR

Average cloud cover in April - San Juan, PR
  • Average cloud cover in April: 30

The month with the most cloud cover is December (Cloud cover 35).
The month with the least cloud cover is September (Cloud cover 26).

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Average visibility in April
San Juan, PR

Average visibility in April - San Juan, PR
  • Average visibility in April: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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