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, with an average high of 85.1°F (29.5°C) and a low of 79.2°F (26.2°C), signifies the warmest month of the year.

Heat index

August's mean heat index is estimated at a torrid 96.8°F (36°C). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
In the scope of the heat index, its values resonate with shade and light wind conditions. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Younglings frequently fail to recognize the requirement to rest and rehydrate. Thirst emerges late in dehydration - it is imperative to keep hydration levels high, particularly during extended physical exertions.
The body's innate mechanism to counteract overheating is through perspiration, as it leverages the cooling effects of sweat evaporation. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

In August, the average relative humidity is 78%.

Rainfall

In San Juan, in August, it is raining for 14.8 days, with typically 1.06" (27mm) 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 August is 84.6°F (29.2°C).
Note: Water activities in temperatures ranging from 77°F (25°C) to 84.2°F (29°C) are pleasurable, without feeling uncomfortable even during extended periods.

Daylight

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

Sunshine

The average sunshine in August is 9.1h.

UV index

The months with the highest UV index are April through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index of 7 during August translates into these guidelines:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Warning! The Sun's UV rays intensify with reflections from sand and water.