July weather forecast
San Juan, PR

July continues the summer heat in San Juan with the year's highest average high temperature of 84.2°F (29°C). Interestingly, the month also sees the year's maximum wind speed at a moderate 10.7mph (17.2km/h). The sea temperature swings to a comfortable 83.6°F (28.7°C) fostering waterside activities. Despite increased cloud cover, sunshine hours remain relatively high. These elements augment the essence of a vibrant Caribbean summer in the city.

Temperature

San Juan's average high-temperature in July is on par with the preceding month. An average low-temperature of 78.8°F (26°C) is witnessed throughout the month of July in San Juan, Puerto Rico, a mere drop from the daytime peak.

Heat index

July's average heat index is calculated to be a torrid 95°F (35°C). Implement more safety precautions, heat cramps and heat exhaustion may happen. Persistent activity could induce heatstroke.
When referencing the heat index, its values are suitable for shady environments and light breezes. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', is the outcome of merging air's temperature and its humidity metrics. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. 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 are quite important for babies and toddlers. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.

Humidity

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

Rainfall

In July, the rain falls for 13.3 days. Throughout July, 1.1" (28mm) of precipitation is accumulated. Throughout the year, there are 159.9 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Ocean temperature

In July, the average ocean temperature is 83.7°F (28.7°C).
Note: For swimming, diving, and similar activities, the water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered delightful, allowing for extended periods of enjoyment without discomfort.

Daylight

In July, the average length of the day in San Juan is 13h and 7min.
On the first day of July, sunrise is at 5:51 am and sunset at 7:05 pm. On the last day of the month, sunrise is at 6:02 am and sunset at 6:59 pm AST.

Sunshine

The average sunshine in July in San Juan is 10.2h.

UV index

April through November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 7 in July transforms into the following instructions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Notice! Sand and water reflections contribute to a stronger UV exposure.