June weather forecast
San Juan, PR

June in San Juan is characterized by peak summer conditions, with average high temperatures reaching 84.2°F (29°C). The sun dominates the sky for an impressive 10.9 hours per day, yet rainfall remains moderate at 0.71" (18mm). Sea temperatures also rise to an appealing 82.8°F (28.2°C), encouraging beachside relaxation amidst the season’s swelter. Despite an increase in humidity, the wind speed remains consistent, providing much-needed respite. These conditions underscore June as a quintessential summer month.

Temperature

June registers an average high-temperature of a still warm 84.2°F (29°C), slightly varied from May's 82.4°F (28°C). Throughout June, San Juan's nights experience a slight temperature dip to a still warm 78.3°F (25.7°C).

Heat index

The heat index for June is appraised at a fiery hot 95°F (35°C). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.
Heat index details are generally centered around shaded locations and a mild breeze. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a composite of temperature and humidity figures to convey how warm it feels. The influence of weather is personal, differing among a variety of individuals based on differences in body mass, stature, and the level of physical activity. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. Increased relative humidity slows down evaporation, thereby decreasing the rate of heat removal from the body, culminating in a sensation of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

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

Rainfall

In June, the rain falls for 10.3 days. Throughout June, 0.71" (18mm) of precipitation is accumulated. Throughout the year, there are 159.9 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Ocean temperature

In San Juan, in June, the average water temperature is 82.9°F (28.3°C).
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are regarded as highly pleasant, making all water activities enjoyable without any discomfort over long durations.

Daylight

June has the longest days of the year, with an average of 13h and 12min of daylight.
On the first day of June in San Juan, 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.

Sunshine

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

UV index

April through November, with an average maximum UV index of 7, are months with the highest UV index in San Juan. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: An average maximum UV index of 7 in June leads to these recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. To the best of your ability, limit your exposure to the sun between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.