July weather forecast and climate
San Juan, PR

An old fort building and a view of the stunning San Juan city, Puerto Rico
An old fort building and a view of the stunning San Juan city, Puerto Rico
July, like June, in San Juan, Puerto Rico, is another warm summer month, with average temperature fluctuating between 78.8°F (26°C) and 84.2°F (29°C).

Temperature

In July, the average high-temperature remains the same as in June - a still warm 84.2°F (29°C). The average low-temperature, is 78.8°F (26°C).

Heat index

In July, the average heat index is evaluated at a hot 94.1°F (34.5°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'felt air temperature', 'real feel', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like wind, pregnancy, differences in body mass, height, and shape, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

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

Rainfall

In July, in San Juan, 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 other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in San Juan, Puerto Rico, is 13.1h.

Sunshine

In San Juan, the average sunshine in July is 10.2h.

UV index

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 the exposure to the Sun's UV rays for the ordinary person.
Note: In July, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in July in San Juan?

The average high-temperature, in July, is 84.2°F (29°C), while the average low-temperature is 78.8°F (26°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that calculates temperature value influenced by the moisture in the air, in July is calculated to 94.1°F (34.5°C).

What are the most humid months in San Juan?

May through July, with an average relative humidity of 79%, are most humid months in San Juan.

What is the average humidity in July in San Juan?

The average relative humidity in July is 79%.

How many days does it rain in July in San Juan?

In San Juan, in July, it is raining for 13.3 days, with typically 1.1" (28mm) of accumulated precipitation.

What is the ocean temperature in July in San Juan?

In San Juan, Puerto Rico, the average seawater temperature in July is 83.7°F (28.7°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

How many hours of daylight does San Juan have in July?

The average length of the day in July in San Juan is 13.1h.

How long on average sun shines in July in San Juan?

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

When is the highest UV index in San Juan?

Months with the highest UV index are April through November, with an average maximum UV index of 7.

What is the UV index reading in July in San Juan?

In San Juan, the average daily maximum UV index in July is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in July - San Juan, PR
  • Average high temperature in July: 29°C

The warmest month (with the highest average high temperature) is August (29.5°C).
Months with the lowest average high temperature are January and March (26.6°C).

  • Average low temperature in July: 26°C

Months with the highest average low temperature are August, September and October (26.2°C).
The coldest month (with the lowest average low temperature) is March (23.3°C).

Average pressure in July - San Juan, PR
  • Average pressure in July: 1016.2mbar

The month with the highest atmospheric pressure is January (1016.6mbar).
The month with the lowest atmospheric pressure is October (1012.6mbar).

Average wind speed in July - San Juan, PR
  • Average wind speed in July: 17.2km/h

The windiest month (with the highest average wind speed) is July (17.2km/h).
The calmest month (with the lowest average wind speed) is October (11.9km/h).

Average humidity in July - San Juan, PR
  • Average humidity in July: 79%

Months with the highest relative humidity are May, June and July (79%).
Months with the lowest relative humidity are February and March (76%).

Average rainfall in July - San Juan, PR
  • Average rainfall in July: 28mm

The wettest month (with the highest rainfall) is November (40mm).
The driest month (with the least rainfall) is April (14mm).

Average rainfall days in July - San Juan, PR
  • Average rainfall days in July: 13.3 days

The month with the highest number of rainy days is November (16.1 days).
The month with the least rainy days is June (10.3 days).

Average sea temperature in July - San Juan, PR
  • Average sea temperature in July: 28.7°C

The best month for swimming (with the highest average sea temperature) is September (29.4°C).
The coldest months (with the lowest average sea temperature) are February and March (26.1°C).

Average daylight in July / Average sunshine in July - San Juan, PR
  • Average daylight in July: 13.1h

The month with the longest days is June (Average daylight: 13.2h).
The month with the shortest days is December (Average daylight: 11h).

  • Average sunshine in July: 10.2h

The month with the most sunshine is June (Average sunshine: 10.9h).
The month with the least sunshine is December (Average sunshine: 6.6h).

Average sunshine days in July - San Juan, PR
  • Average sunshine days in July: 9.8 days

The month with the most sunshine days is June (13.7 days).
The month with the least sunshine days is November (9.4 days).

Average UV index in July - San Juan, PR
  • Average UV index in July: 7

Months with the highest UV index are April, May, June, July, August, September, October and November (UV index 7).
Months with the lowest UV index are January, February, March and December (UV index 6).

Average cloud cover in July - San Juan, PR
  • Average cloud cover in July: 34

The month with the most cloud cover is December (Cloud cover 35).
The month with the least cloud cover is September (Cloud cover 26).

Average visibility in July - San Juan, PR
  • Average visibility in July: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).