August weather forecast
San Juan, PR

August transitions San Juan into a slightly cooler month while still maintaining notable summer characteristics. The month records the highest sea temperature of the year at 84.4°F (29.1°C), inviting an array of beach activities. Rainfall measures at 1.06" (27mm), providing intermittent respite from the sun-bathed cityscape. The wind speed slightly reduces, and so do the sunlight hours. Together, these conditions constitute a subtly tempered yet still radiant summer month.

Temperature

August, recording an average high temperature of 85.1°F (29.5°C) and a low temperature of 79.2°F (26.2°C), is San Juan's warmest month.

Heat index

August's average heat index is calculated to be a sweltering 96.8°F (36°C). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.
Realize that the values for the heat index are set for shaded places and light winds. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are largely significant for babies and toddlers. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

The average relative humidity in August is 78%.

Rainfall

In San Juan, in August, it is raining for 14.8 days, with typically 1.06" (27mm) of accumulated precipitation. Throughout the year, in San Juan, there are 159.9 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Ocean temperature

In San Juan, in August, the average water temperature is 84.6°F (29.2°C).
Note: For swimming, diving, and various water activities, the temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

In August, the average length of the day is 12h and 44min.
On the first day of August in San Juan, sunrise is at 6:02 am and sunset at 6:59 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 6:39 pm AST.

Sunshine

In August, the average sunshine in San Juan is 9.1h.

UV index

The months with the highest UV index in San Juan are April through November, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: In August, the UV index of 7 transforms into the following advice:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.