June weather forecast and climate
San Juan, PR

An old fort building and a view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront
An old fort building and a view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront
The first month of the summer, June, is still a warm month in San Juan, Puerto Rico, with average temperature fluctuating between 84.2°F (29°C) and 78.3°F (25.7°C).

Temperature

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

Heat index

The average heat index is evaluated at a hot 94.1°F (34.5°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. 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 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like wind, differences in body mass, height, and shape, metabolic differences, and activity influence one's weather impression. 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

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

Rainfall

In San Juan, it is raining for 10.3 days, with typically 0.71" (18mm) of accumulated precipitation. Throughout the year, in San Juan, Puerto Rico, there are 159.9 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Ocean temperature

In June, the average ocean temperature in San Juan, Puerto Rico, is 82.9°F (28.3°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

June has the longest days of the year in San Juan, Puerto Rico, with an average of 13.2h of daylight.

Sunshine

With an average of 10.9h of sunshine, June has the most sunshine of the year.

UV index

April through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: In June, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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.

What is the temperature in June in San Juan?

In San Juan, in June, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 78.3°F (25.7°C). In June, the average heat index (a.k.a. 'real feel', 'felt air temperature'), that represents influence of the relative humidity to air temperaure, is appraised at 94.1°F (34.5°C).

What are the most humid months in San Juan?

Months with the highest humidity in San Juan, Puerto Rico, are May through July, with an average relative humidity of 79%.

What is the average humidity in June in San Juan?

In San Juan, the average relative humidity in June is 79%.

How much does it rain in San Juan in June?

In June, in San Juan, Puerto Rico, the rain falls for 10.3 days. Throughout June, 0.71" (18mm) of precipitation is accumulated.

What is the water temperature in June in San Juan?

In June, the average ocean temperature in San Juan, Puerto Rico, is 82.9°F (28.3°C). 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.

When are the longest days in San Juan?

With an average of 13.2h of daylight, June has the longest days of the year in San Juan.

How many hours of daylight does San Juan have in June?

In June, the average length of the day in San Juan is 13.2h.

What month has the most sunshine in San Juan?

The month with the most sunshine in San Juan, Puerto Rico, is June, with an average of 10.9h of sunshine.

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

In June, the average sunshine in San Juan is 10.9h.

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

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

What is the UV index reading in June in San Juan?

In San Juan, Puerto Rico, the average daily maximum UV index in June is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in June - San Juan, PR
  • Average high temperature in June: 29°C

The warmest month (with the highest average high temperature) is August (29.5°C).
Months with the lowest average high temperature are January and March (26.6°C).

  • Average low temperature in June: 25.7°C

Months with the highest average low temperature are August, September and October (26.2°C).
The coldest month (with the lowest average low temperature) is March (23.3°C).

Average pressure in June - San Juan, PR
  • Average pressure in June: 1016.2mbar

The month with the highest atmospheric pressure is January (1016.6mbar).
The month with the lowest atmospheric pressure is October (1012.6mbar).

Average wind speed in June - San Juan, PR
  • Average wind speed in June: 15.5km/h

The windiest month (with the highest average wind speed) is July (17.2km/h).
The calmest month (with the lowest average wind speed) is October (11.9km/h).

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

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

Average rainfall in June - San Juan, PR
  • Average rainfall in June: 18mm

The wettest month (with the highest rainfall) is November (40mm).
The driest month (with the least rainfall) is April (14mm).

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).

Average sea temperature in June - San Juan, PR
  • Average sea temperature in June: 28.3°C

The best month for swimming (with the highest average sea temperature) is September (29.4°C).
The coldest months (with the lowest average sea temperature) are February and March (26.1°C).

Average daylight in June / Average sunshine in June - San Juan, PR
  • Average daylight in June: 13.2h

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 June: 10.9h

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

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).

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

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).

Average visibility in June - San Juan, PR
  • Average visibility in June: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).