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

With the onset of June, the average high-temperature registers at a still moderately hot 84.2°F (29°C), subtly different from May's 82.4°F (28°C). San Juan records a negligible downturn from daytime temperatures, averaging a low of 78.3°F (25.7°C) in the month of June.

Heat index

The heat index for June is calculated to be a very hot 95°F (35°C). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Heat index details are generally centered around shaded locations and a mild breeze. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' 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. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Always consider that direct sunlight exposure might heighten the heat's effects, pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Juveniles are regularly less conscious of the need to recuperate and rehydrate. Thirst is a tardy symptom of dehydration - hydration, especially during lengthy physical activities, should be maintained.
As a reaction to high temperatures, the human body begins to perspire, using the evaporation of sweat to lower its temperature. In the presence of high relative humidity, the evaporation rate diminishes, resulting in the body retaining more warmth compared to dry conditions. Excessive heat gain, when not shed effectively by the body, can result in increasing body temperatures and related hazards.

Humidity

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

Rainfall

In San Juan, Puerto Rico, in June, 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: Temperatures between 77°F (25°C) and 84.2°F (29°C) are excellent for swimming, diving, and other water activities, providing comfort and enjoyment for extended periods without discomfort.

Daylight

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

The months with the highest UV index are April through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The UV index of 7 during June translates into the following guidance:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.