San Juan
Puerto Rico, USA
Long-term weather forecast
Long-term weather forecast

October weather forecast and climate
San Juan, PR

An old fort building and a view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront
An old fort building and a view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront
October, like September, in San Juan, Puerto Rico, is another warm autumn month, with average temperature ranging between min 79.2°F (26.2°C) and max 84.6°F (29.2°C).

Temperature

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

Heat index

The average heat index in October is appraised at 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', 'apparent temperature', or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, differences in body mass, height, and shape, pregnancy), and activity. 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

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

Rainfall

In October, in San Juan, Puerto Rico, the rain falls for 15.8 days. Throughout October, 1.5" (38mm) of precipitation is accumulated. Throughout the year, there are 159.9 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Ocean temperature

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

Daylight

The average length of the day in San Juan is 11.7h.

Sunshine

The average sunshine in San Juan, Puerto Rico, is 8.2h.

UV index

Months with the highest UV index in San Juan, Puerto Rico, are April through November, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 7 in October transform into the following instructions:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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.

What is the temperature in October in San Juan?

The average high-temperature, in October, in San Juan, Puerto Rico, 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 relative humidity and air temperature, 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, during October, the rain falls for 15.8 days and regularly aggregates up to 1.5" (38mm) of precipitation.

What is the water 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.

What is the average length of the day in October in San Juan?

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

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

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.

How high is the UV index in October in San Juan?

In San Juan, Puerto Rico, the average daily maximum UV index in October is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays.
Average temperature in October - San Juan, PR
  • Average high temperature in October: 29.2°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 October: 26.2°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 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%).

Average rainfall in October - San Juan, PR
  • Average rainfall in October: 38mm

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

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 lowest number of rainy days is June (10.3 days).

Average sea temperature in October - San Juan, PR
  • Average sea temperature in October: 29.1°C

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

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 shortest days is December (Average daylight: 11h).

  • Average sunshine in October: 8.2h

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

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).