June 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 June

The first month of the summer, June, is still a warm month in San Juan, Puerto Rico, with temperature in the range of an average low of 78.3°F (25.7°C) and an average high of 84.2°F (29°C).

Temperature

In June, the average high-temperature is relatively the same as in May - a still moderately hot 84.2°F (29°C). In June, in San Juan, the average low-temperature is 78.3°F (25.7°C).

Heat index

The average heat index in June is computed to be a torrid 95°F (35°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like wind, differences in body mass, height, and shape, clothing, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index 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.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 99.5°F (37.5°C) to 100.9°F (38.3°C), thermal conditions are potentially life-threatening.

Humidity

May through July, with an average relative humidity of 79%, are the most humid months in San Juan.

Rainfall

In San Juan, it is raining for 10.3 days, with typically 0.71" (18mm) of accumulated precipitation. In San Juan, during the entire year, the rain falls for 159.9 days and collects up to 12.01" (305mm) of precipitation.

Ocean temperature

In San Juan, the average seawater temperature in June is 82.9°F (28.3°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

With an average of 13h and 13min of daylight, June has the longest days of the year.
On the first day of the month, sunrise is at 5:47 am and sunset at 6:57 pm. On the last day of June, in San Juan, sunrise is at 5:51 am and sunset at 7:04 pm AST.

Sunshine

The month with the most sunshine is June, with an average of 10.9h of sunshine.

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 average person.
Note: In June, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in June in San Juan?

The average high-temperature, in June, in San Juan, Puerto Rico, is 84.2°F (29°C), while the average low-temperature is 78.3°F (25.7°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in June is computed to be 95°F (35°C).

What are the most humid months in San Juan?

The months with the highest humidity are May through July, with an average relative humidity of 79%.

What is the average humidity in June in San Juan?

The average relative humidity in June in San Juan, Puerto Rico, is 79%.

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

In San Juan, in June, it is raining for 10.3 days, with typically 0.71" (18mm) of accumulated precipitation.

What is the ocean temperature in June in San Juan?

In San Juan, in June, the average water temperature is 82.9°F (28.3°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

When are the longest days in San Juan?

June has the longest days of the year in San Juan, Puerto Rico, with an average of 13h and 13min of daylight.

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

The average day length in June in San Juan is 13h and 13min.

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

On the first day of June in San Juan, Puerto Rico, sunrise is at 5:47 am and sunset at 6:57 pm. On the last day of the month, sunrise is at 5:51 am and sunset at 7:04 pm AST.

What month has the most sunshine in San Juan?

June has the most sunshine of the year in San Juan, Puerto Rico, with an average of 10.9h of sunshine.

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

In June, the average sunshine duration is 10.9h.

What is the month 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 reading in June in San Juan?

In June, the average daily maximum UV index in San Juan, Puerto Rico, is 7. A UV Index reading of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.

Average temperature in June
San Juan, PR

Average temperature in June - San Juan, PR
  • Average high temperature in June: 84.2°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 June: 78.3°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 June
San Juan, PR

Average pressure in June - San Juan, PR
  • Average pressure in June: 30.01"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 June
San Juan, PR

Average wind speed in June - San Juan, PR
  • Average wind speed in June: 9.6mph

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 June
San Juan, PR

Average humidity in June - San Juan, PR
  • Average humidity in June: 79%

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 June
San Juan, PR

Average rainfall in June - San Juan, PR
  • Average rainfall in June: 0.71"

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 June
San Juan, PR

Average rainfall days in June - San Juan, PR
  • Average rainfall days in June: 10.3 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 June
San Juan, PR

Average sea temperature in June - San Juan, PR
  • Average sea temperature in June: 82.8°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 June /
Average sunshine in June
San Juan, PR

Average daylight in June / Average sunshine in June - San Juan, PR
  • Average daylight in June: 13h and 13min

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 June: 10h and 54min

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 June
San Juan, PR

Average sunshine days in June - San Juan, PR
  • Average sunshine days in June: 13.7 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 June
San Juan, PR

Average UV index in June - San Juan, PR
  • Average UV index in June: 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 June
San Juan, PR

Average cloud cover in June - San Juan, PR
  • Average cloud cover in June: 32

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 June
San Juan, PR

Average visibility in June - San Juan, PR
  • Average visibility in June: 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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