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

With the advent of July, San Juan experiences an average high-temperature of a still warm 84.2°F (29°C), reflecting the conditions of June. San Juan, during July nights, observes a steady temperature, averaging at a still warm 78.8°F (26°C).

Heat index

During July, the heat index is calculated to be a torrid 95°F (35°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
Observations indicate that the heat index values are for shady locations with light wind. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is a single figure representing how weather conditions feel when combining temperature and humidity. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones generally face higher dangers than adults since they sweat less. Along with their large skin surface area compared totheir small bodies and increased heat production from their activities, the risks are heightened.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

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. 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 July, the average ocean temperature in San Juan is 83.7°F (28.7°C).
Note: Surface water temperatures falling between 77°F (25°C) and 84.2°F (29°C) are regarded as prime and extremely agreeable for enduring periods during any water activity.

Daylight

The average length of the day in July 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 is 10.2h.

UV index

The months with the highest UV index are April through November, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In July, a daily UV index of 7 turns into the following recommendations:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. 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. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.