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

Weather in July

July, like June, in San Juan, Puerto Rico, is a moderately hot summer month, with average temperature fluctuating between 84.2°F (29°C) and 78.8°F (26°C).

Temperature

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

Heat index

The average heat index is appraised at a tropical 94.1°F (34.5°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
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 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, wind, differences in body mass, height, and shape, and pregnancy affect individual temperature impact. 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 San Juan, during 13.3 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. 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, the average seawater temperature in July is 83.7°F (28.7°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In San Juan, the average length of the day is 13.1h.

Sunshine

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 reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays for the average 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. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in July in San Juan?

In San Juan, Puerto Rico, in July, the average high-temperature is 84.2°F (29°C), and the average low-temperature is 78.8°F (26°C). In July, the average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines air temperature and relative humidity, is calculated to 94.1°F (34.5°C).

What is the most humid month in San Juan?

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

What is the average humidity in July in San Juan?

In July, the average relative humidity in San Juan, Puerto Rico, is 79%.

How much does it rain in San Juan in July?

In San Juan, Puerto Rico, 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, in July, the average water temperature 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?

In July, the average length of the day in San Juan, Puerto Rico, 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.

What are the months with the highest UV index in San Juan?

April through November, with an average maximum UV index of 7, are months with the highest UV index in San Juan, Puerto Rico.

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

In July, the average daily maximum UV index in San Juan, Puerto Rico, is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to the UV radiation.

Average temperature in July
San Juan, PR

Average temperature in July - San Juan, PR
  • Average high temperature in July: 84.2°F

The warmest month (with the highest average high temperature) is August (85.1°F).
Months with the lowest average high temperature are January and March (79.9°F).

  • Average low temperature in July: 78.8°F

Months with the highest average low temperature are August, September and October (79.2°F).
The coldest month (with the lowest average low temperature) is March (73.9°F).

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Average pressure in July
San Juan, PR

Average pressure in July - San Juan, PR
  • Average pressure in July: 30.01"

Months with the highest atmospheric pressure are January and February (30.02").
The month with the lowest atmospheric pressure is October (29.9").

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Average wind speed in July
San Juan, PR

Average wind speed in July - San Juan, PR
  • Average wind speed in July: 10.7mph

The windiest month (with the highest average wind speed) is July (10.7mph).
The calmest month (with the lowest average wind speed) is October (7.4mph).

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Average humidity in July
San Juan, PR

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%).

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Average rainfall in July
San Juan, PR

Average rainfall in July - San Juan, PR
  • Average rainfall in July: 1.1"

The wettest month (with the highest rainfall) is November (1.57").
The driest month (with the least rainfall) is April (0.55").

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Average rainfall days in July
San Juan, PR

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).

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Average sea temperature in July
San Juan, PR

Average sea temperature in July - San Juan, PR
  • Average sea temperature in July: 83.6°F

The best month for swimming (with the highest average sea temperature) is September (84.9°F).
The coldest month (with the lowest average sea temperature) is February (78.9°F).

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Average daylight in July /
Average sunshine in July
San Juan, PR

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).

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Average sunshine days in July
San Juan, PR

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).

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Average UV index in July
San Juan, PR

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).

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Average cloud cover in July
San Juan, PR

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).

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Average visibility in July
San Juan, PR

Average visibility in July - San Juan, PR
  • Average visibility in July: 6mi

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

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