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

Monthly 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
January, like December, in San Juan, Puerto Rico, is a moderately hot winter month, with average temperature ranging between max 83.1°F (28.4°C) and min 72°F (22.2°C). January is the coldest month, with an average high-temperature of 83.1°F (28.4°C) and an average low-temperature of 72°F (22.2°C). The average heat index is calculated to a tropical 89.8°F (32.1°C). Weather in January »
February, the last month of the winter, in San Juan, is also a moderately hot month, with average temperature ranging between min 72°F (22.2°C) and max 83.7°F (28.7°C). In February, the average high-temperature is essentially the same as in January - a still moderately hot 83.7°F (28.7°C). Weather in February »

The first month of the spring, March, is still a warm month in San Juan, Puerto Rico, with temperature in the range of an average high of 84.9°F (29.4°C) and an average low of 72.9°F (22.7°C). In San Juan, the average high-temperature in March is practically the same as in February - a still warm 84.9°F (29.4°C). Weather in March »

April is a tropical spring month in San Juan, Puerto Rico, with temperature in the range of an average high of 86.2°F (30.1°C) and an average low of 74.5°F (23.6°C). In April, the average high-temperature is practically the same as in March - a hot 86.2°F (30.1°C). Weather in April »

The last month of the spring, May, is another tropical month in San Juan, Puerto Rico, with temperature in the range of an average high of 87.4°F (30.8°C) and an average low of 76.3°F (24.6°C). In May, the average high-temperature is practically the same as in April - a still hot 87.4°F (30.8°C). Weather in May »

The first month of the summer, June, is still a hot month in San Juan, Puerto Rico, with average temperature ranging between min 77.7°F (25.4°C) and max 88.9°F (31.6°C). In June, the average high-temperature is relatively the same as in May - a still tropical 88.9°F (31.6°C). Weather in June »

July, the same as June, in San Juan, Puerto Rico, is a hot summer month, with average temperature ranging between min 78.1°F (25.6°C) and max 88.7°F (31.5°C). In July, the average high-temperature is practically the same as in June - a still hot 88.7°F (31.5°C). Weather in July »

The last month of the summer, August, is another hot month in San Juan, Puerto Rico, with average temperature ranging between min 78.3°F (25.7°C) and max 89.2°F (31.8°C). August and September, with an average high-temperature of 89.2°F (31.8°C), are the warmest months. The average heat index in August is calculated to a blistering 108°F (42.2°C). Weather in August »

September, the first month of the autumn, in San Juan, is also a hot month, with temperature in the range of an average high of 89.2°F (31.8°C) and an average low of 77.7°F (25.4°C). August and September, with an average high-temperature of 89.2°F (31.8°C), are the warmest months. The average heat index is calculated to an extremely hot 108°F (42.2°C). Weather in September »

October, the same as September, in San Juan, Puerto Rico, is another tropical 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). In San Juan, the average high-temperature in October is practically the same as in September - a still tropical 88.3°F (31.3°C). Weather in October »

The last month of the autumn, November, is another warm month in San Juan, Puerto Rico, with average temperature varying between 85.8°F (29.9°C) and 75.2°F (24°C). In November, the average high-temperature is almost the same as in October - a moderately hot 85.8°F (29.9°C). Weather in November »

The first month of the winter, December, is also a moderately hot month in San Juan, Puerto Rico, with average temperature varying between 73.4°F (23°C) and 83.8°F (28.8°C). In December, the average high-temperature is relatively the same as in November - a still warm 83.8°F (28.8°C). Weather in December »

What is the coldest month in San Juan?

The coldest month in San Juan is January, with an average high-temperature of 83.1°F (28.4°C) and an average low-temperature of 72°F (22.2°C).

How many days does it rain in San Juan?

In San Juan, Puerto Rico, during the entire year, the rain falls for 198.5 days and collects up to 70.6" (1794mm) of precipitation.

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

January and December, with an average maximum UV index of 8, are months with the lowest UV index in San Juan, Puerto Rico.

What are the months with the coldest ocean in San Juan?

February and March, with an average ocean temperature of 79°F (26.1°C), are months with the coldest seawater in San Juan.

What is the least humid month in San Juan?

March is the least humid month in San Juan, with an average relative humidity of 71%.

What is the driest month in San Juan?

March is the month with the least rainfall in San Juan, Puerto Rico. Rain falls for 12.2 days and accumulates 3.1" (79mm) of precipitation.

What are the months with the most sunshine in San Juan?

Months with the most sunshine in San Juan, Puerto Rico, are March and July, with an average of 9.1h of sunshine.

What is the month with the highest UV index in San Juan?

Months with the highest UV index in San Juan are March through September, with an average maximum UV index of 12.

When are the longest days in San Juan?

The month with the longest days in San Juan is June, with an average of 13.2h of daylight.

What are the warmest months in San Juan?

August and September, with an average high-temperature of 89.2°F (31.8°C), are warmest months in San Juan.

What is the rainiest month in San Juan?

August is the month with the most rainfall in San Juan, Puerto Rico. Rain falls for 18.5 days and accumulates 7.7" (195mm) of precipitation.

What month is the ocean warmest in San Juan?

The month with the warmest seawater is September, with an average ocean temperature of 84.9°F (29.4°C).

What is the most humid month in San Juan?

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

What is the month with the least sunshine in San Juan?

November has the least sunshine of the year, with an average of 6.7h of sunshine.

What is the month with the shortest days in San Juan?

With an average of 11h of daylight, December has the shortest days of the year.
Average temperature - San Juan, PR

Warmest months (with the highest average high temperature) are August and September (31.8°C).
The month with the lowest average high temperature is January (28.4°C).

The month with the highest average low temperature is August (25.7°C).
Coldest months (with the lowest average low temperature) are January and February (22.2°C).

Average humidity - San Juan, PR
Average rainfall - San Juan, PR
Average rainfall days - San Juan, PR

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 - San Juan, PR

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 / Average sunshine - San Juan, PR

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

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 - San Juan, PR

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).