San Juan
Puerto Rico, USA
Long-term weather forecast
Long-term weather forecast

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 hot month in San Juan, Puerto Rico, with average temperature ranging between min 77.7°F (25.4°C) and max 88.9°F (31.6°C).

Temperature

In June, the average high-temperature is relatively the same as in May - a still tropical 88.9°F (31.6°C). In June, the average low-temperature is 77.7°F (25.4°C).

Heat index

In June, the average heat index is evaluated at a scorching 106.2°F (41.2°C). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. 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 'real feel', 'felt air temperature', 'feels like', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, pregnancy, differences in body mass, height, and shape). 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. 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.
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. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In June, the average relative humidity in San Juan is 75.5%.

Rainfall

In San Juan, in June, it is raining for 14.4 days, with typically 5.9" (151mm) of accumulated precipitation. Throughout the year, in San Juan, there are 198.5 rainfall days, and 70.6" (1794mm) of precipitation is accumulated.

Ocean temperature

In San Juan, the average seawater temperature in June 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

The month with the longest days in San Juan is June, with an average of 13.2h of daylight.

Sunshine

In San Juan, the average sunshine is 8.6h.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an extreme threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 12 interpret into the following advice:
Practice all-important precautions. Light skin people may get burned in less than 5 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in June in San Juan?

In San Juan, in June, the average high-temperature is 88.9°F (31.6°C), and the average low-temperature is 77.7°F (25.4°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), that represents influence of the relative humidity to air temperaure, in June is estimated at 106.2°F (41.2°C).

What is the average humidity in June in San Juan?

The average relative humidity in June in San Juan is 75.5%.

How much does it rain in San Juan in June?

In San Juan, Puerto Rico, in June, it is raining for 14.4 days, with typically 5.9" (151mm) of accumulated precipitation.

How warm is the water in June in San Juan?

In San Juan, the average seawater temperature in June 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?

The month with the longest days in San Juan, Puerto Rico, is June, with an average of 13.2h of daylight.

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

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

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

In San Juan, Puerto Rico, the average sunshine in June is 8.6h.

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

March through September, with an average maximum UV index of 12, are months with the highest UV index.

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 12. A UV Index estimate of 11, and higher, represents an extreme health threat from unsafe exposure to the Sun's UV rays.
Average temperature in June - San Juan, PR
  • Average high temperature in June: 88.9°F

Warmest months (with the highest average high temperature) are August and September (89.2°F).
The month with the lowest average high temperature is January (83.2°F).

  • Average low temperature in June: 77.7°F

The month with the highest average low temperature is August (78.2°F).
Coldest months (with the lowest average low temperature) are January and February (72°F).

Average humidity in June - San Juan, PR
  • Average humidity in June: 75.5%

The month with the highest relative humidity is October (76.9%).
The month with the lowest relative humidity is March (71%).

Average rainfall in June - San Juan, PR
  • Average rainfall in June: 5.9"

The wettest month (with the highest rainfall) is August (7.7").
The driest month (with the lowest rainfall) is March (3.1").

Average rainfall days in June - San Juan, PR
  • Average rainfall days in June: 14.4 days

Months with the highest number of rainy days are November and December (19.6 days).
The month with the lowest number of rainy days is March (12.2 days).

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).

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 shortest days is December (Average daylight: 11h).

  • Average sunshine in June: 8.6h

Months with most sunshine are March and July (Average sunshine: 9.1h).
The month with least sunshine is November (Average sunshine: 6.7h).

Average UV index in June - San Juan, PR
  • Average UV index in June: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
Months with the lowest UV index are January and December (UV index 8).