October 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 October

October, like September, in San Juan, Puerto Rico, is another warm autumn month, with average temperature varying between 84.6°F (29.2°C) and 79.2°F (26.2°C).

Temperature

In San Juan, the average high-temperature is essentially the same as in September - a still warm 84.6°F (29.2°C). In San Juan, the average low-temperature is 79.2°F (26.2°C).

Heat index

In October, the average heat index is calculated to a tropical 94.6°F (34.8°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. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'feels like', or 'apparent temperature', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, pregnancy, clothing), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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

The average relative humidity in October is 78%.

Rainfall

In October, in San Juan, the rain falls for 15.8 days. Throughout October, 1.5" (38mm) 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 October, the average ocean temperature is 84.4°F (29.1°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

In October, the average length of the day is 11.7h.

Sunshine

In San Juan, the average sunshine is 8.2h.

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 risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: In October, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in October in San Juan?

The average high-temperature, in October, in San Juan, is 84.6°F (29.2°C), while the average low-temperature is 79.2°F (26.2°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines both air temperature and relative humidity, in October is appraised at 94.6°F (34.8°C).

What is the average humidity in October in San Juan?

In San Juan, Puerto Rico, the average relative humidity in October is 78%.

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

In San Juan, Puerto Rico, in October, it is raining for 15.8 days, with typically 1.5" (38mm) of accumulated precipitation.

What is the ocean temperature in October in San Juan?

In San Juan, Puerto Rico, in October, the average water temperature is 84.4°F (29.1°C). 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.

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

The average length of the day in October in San Juan, Puerto Rico, is 11.7h.

How many hours of sunshine does San Juan have in October?

In San Juan, the average sunshine in October is 8.2h.

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 October in San Juan?

In October, the average daily maximum UV index in San Juan is 7. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV radiation.

Average temperature in October
San Juan, PR

Average temperature in October - San Juan, PR
  • Average high temperature in October: 84.6°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 October: 79.2°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 October
San Juan, PR

Average pressure in October - San Juan, PR
  • Average pressure in October: 29.9"

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 October
San Juan, PR

Average wind speed in October - San Juan, PR
  • Average wind speed in October: 7.4mph

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 October
San Juan, PR

Average humidity in October - San Juan, PR
  • Average humidity in October: 78%

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 October
San Juan, PR

Average rainfall in October - San Juan, PR
  • Average rainfall in October: 1.5"

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 October
San Juan, PR

Average rainfall days in October - San Juan, PR
  • Average rainfall days in October: 15.8 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 October
San Juan, PR

Average sea temperature in October - San Juan, PR
  • Average sea temperature in October: 84.4°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 October /
Average sunshine in October
San Juan, PR

Average daylight in October / Average sunshine in October - San Juan, PR
  • Average daylight in October: 11.7h

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 October: 8.2h

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 October
San Juan, PR

Average sunshine days in October - San Juan, PR
  • Average sunshine days in October: 10 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 October
San Juan, PR

Average UV index in October - San Juan, PR
  • Average UV index in October: 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 October
San Juan, PR

Average cloud cover in October - San Juan, PR
  • Average cloud cover in October: 28

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 October
San Juan, PR

Average visibility in October - San Juan, PR
  • Average visibility in October: 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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