April weather forecast
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, like March, in San Juan, Puerto Rico, is another warm spring month, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 75.2°F (24°C).

Temperature

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

Heat index

The average heat index in April 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 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', 'real feel', or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, pregnancy, clothing), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

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

Rainfall

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

Ocean temperature

In San Juan, the average water temperature is 80.4°F (26.9°C).
Note: 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.

Daylight

The average length of the day in April is 12h and 34min.
On the first day of April, sunrise is at 6:18 am and sunset at 6:38 pm. On the last day of the month, sunrise is at 5:57 am and sunset at 6:45 pm AST.

Sunshine

The average sunshine in April in San Juan is 9.1h.

UV index

The months with the highest UV index are April through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 7 in April transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in April in San Juan?

In San Juan, in April, the average high-temperature is 81.1°F (27.3°C), and the average low-temperature is 75.2°F (24°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in April is appraised at 86.2°F (30.1°C).

What is the average humidity in April in San Juan?

The average relative humidity in April in San Juan is 77%.

What is the driest month in San Juan?

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

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

In San Juan, Puerto Rico, during April, the rain falls for 12.4 days and regularly aggregates up to 0.55" (14mm) of precipitation.

What is the ocean temperature in April in San Juan?

In April, the average ocean temperature 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?

In April, the average day length is 12h and 34min.

When is the sunrise / sunset in April in San Juan?

In April, on the first day of the month, sunrise is at 6:18 am and sunset at 6:38 pm. On the last day of the month, in San Juan, sunrise is at 5:57 am and sunset at 6:45 pm AST.

How many hours of sunshine does San Juan have in April?

The average sunshine duration in April is 9.1h.

What is the month with the highest UV index in San Juan?

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

How high is the UV index in April in San Juan?

In April, the average daily maximum UV index in San Juan, Puerto Rico, is 7. A UV Index value of 6 to 7 symbolizes a high health threat from exposure to the Sun's 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).
The months with the lowest average high temperature are January and March (79.9°F).

  • Average low temperature in April: 75.2°F

The 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"Hg

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

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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%

The months with the highest relative humidity are May, June and July (79%).
The 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: 12h and 34min

The month with the longest days is June (Average daylight: 13h and 13min).
The month with the shortest days is December (Average daylight: 11h and 2min).

  • Average sunshine in April: 9h and 6min

The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

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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

The months with the highest UV index are April, May, June, July, August, September, October and November (UV index 7).
The 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

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

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