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, the same as September, in San Juan, Puerto Rico, is a hot autumn month, with temperature in the range of an average low of 76.8°F (24.9°C) and an average high of 88.3°F (31.3°C).

Temperature

In October, the average high-temperature is essentially the same as in September - a still hot 88.3°F (31.3°C). In October, in San Juan, the average low-temperature is 76.8°F (24.9°C).

Humidity

The most humid month is October, with an average relative humidity of 76.9%.

Rainfall

In October, the rain falls for 17.7 days. Throughout October, 6.7" (171mm) of precipitation is accumulated. In San Juan, during the entire year, the rain falls for 198.5 days and collects up to 70.6" (1794mm) of precipitation.

Ocean temperature

In October, the average ocean temperature in San Juan 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.

Daylight

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

Sunshine

The average sunshine in October is 7.3h.

UV index

The average daily maximum UV index in San Juan is 10. A UV Index of 8 to 10 symbolizes a very high health risk from the exposure to the Sun's UV radiation for the average person.
The daily maximum UV index of 10 interpret into the following advice:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. 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. 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. Even on cloudy days, a sunscreen with a minimum 30 sun protection factor should be generously applied and frequently re-applied, including after every swim or outdoor exercise. 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?

In San Juan, Puerto Rico, in October, the average high-temperature is 88.3°F (31.3°C), and the average low-temperature is 76.8°F (24.9°C).

What is the most humid month in San Juan?

The most humid month in San Juan is October, with an average relative humidity of 76.9%.

What is the average humidity in October in San Juan?

In October, the average relative humidity is 76.9%.

How much does it rain in San Juan in October?

In San Juan, in October, it is raining for 17.7 days, with typically 6.7" (171mm) of accumulated 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 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 October?

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

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

The average sunshine in October is 7.3h.

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

In San Juan, the average daily maximum UV index in October is 10. A UV Index reading of 8 to 10 represents a very high health risk from unprotected exposure to the UV radiation.
Average temperature in October - San Juan, PR
  • Average high temperature in October: 88.4°F

Warmest months (with the highest average high temperature) are August and September (89.2°F).
The month with the lowest average high temperature is January (83.2°F).

  • Average low temperature in October: 76.9°F

The month with the highest average low temperature is August (78.2°F).
Coldest months (with the lowest average low temperature) are January and February (72°F).

Average humidity in October - San Juan, PR
  • Average humidity in October: 76.9%

The month with the highest relative humidity is October (76.9%).
The month with the lowest relative humidity is March (71%).

Average rainfall in October - San Juan, PR
  • Average rainfall in October: 6.7"

The wettest month (with the highest rainfall) is August (7.7").
The driest month (with the lowest rainfall) is March (3.1").

Average rainfall days in October - San Juan, PR
  • Average rainfall days in October: 17.7 days

Months with the highest number of rainy days are November and December (19.6 days).
The month with the lowest number of rainy days is March (12.2 days).

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).

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: 7.3h

Months with most sunshine are March and July (Average sunshine: 9.1h).
The month with least sunshine is November (Average sunshine: 6.7h).

Average UV index in October - San Juan, PR
  • Average UV index in October: 10

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
Months with the lowest UV index are January and December (UV index 8).