Climate and monthly weather forecast
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 January

January, like December, in San Juan, Puerto Rico, is another warm winter month, with an average temperature varying between 74.7°F (23.7°C) and 79.9°F (26.6°C). January and March, with an average high-temperature of 79.9°F (26.6°C), are the coldest months. Weather in January »

Weather in February

February, the last month of the winter in San Juan, is another warm month, with an average temperature ranging between max 80.1°F (26.7°C) and min 74.1°F (23.4°C). In February, the average high-temperature is almost the same as in January - a still warm 80.1°F (26.7°C). Weather in February »

Weather in March

The first month of the spring, March, is also a moderately hot month in San Juan, Puerto Rico, with an average temperature varying between 79.9°F (26.6°C) and 73.9°F (23.3°C). January and March, with an average high-temperature of 79.9°F (26.6°C), are the coldest months. Weather in March »

Weather in April

April, the same as March, is a moderately hot spring month in San Juan, Puerto Rico, with an average temperature varying between 75.2°F (24°C) and 81.1°F (27.3°C). In San Juan, the average high-temperature in April is almost the same as in March - a still warm 81.1°F (27.3°C). Weather in April »

Weather in May

The last month of the spring, May, is also a moderately hot month in San Juan, Puerto Rico, with an average temperature varying between 82.4°F (28°C) and 76.6°F (24.8°C). In May, the average high-temperature is practically the same as in April - a still warm 82.4°F (28°C). Weather in May »

Weather in June

The first month of the summer, June, is also a moderately hot month in San Juan, Puerto Rico, with temperature in the range of an average high of 84.2°F (29°C) and an average low of 78.3°F (25.7°C). In June, the average high-temperature is essentially the same as in May - a still moderately hot 84.2°F (29°C). Weather in June »

Weather in July

July, like June, in San Juan, Puerto Rico, is another warm summer month, with an average temperature varying between 84.2°F (29°C) and 78.8°F (26°C). In July, the average high-temperature remains equal as in June - a still moderately hot 84.2°F (29°C). Weather in July »

Weather in August

August, the last month of the summer in San Juan, is another warm month, with an average temperature varying between 85.1°F (29.5°C) and 79.2°F (26.2°C). The warmest month is August, with an average high-temperature of 85.1°F (29.5°C) and an average low-temperature of 79.2°F (26.2°C). In August, the average heat index is evaluated at a torrid 96.8°F (36°C). Weather in August »

Weather in September

September, the first month of the autumn in San Juan, is still a warm month, with an average temperature ranging between min 79.2°F (26.2°C) and max 84.9°F (29.4°C). In September, the average high-temperature is practically the same as in August - a still moderately hot 84.9°F (29.4°C). Weather in September »

Weather in October

October, the same as September, is a moderately hot autumn month in San Juan, Puerto Rico, with an average temperature fluctuating between 79.2°F (26.2°C) and 84.6°F (29.2°C). In San Juan, the average high-temperature in October is relatively the same as in September - a still warm 84.6°F (29.2°C). Weather in October »

Weather in November

The last month of the autumn, November, is another warm month in San Juan, Puerto Rico, with temperature in the range of an average high of 83.1°F (28.4°C) and an average low of 77.9°F (25.5°C). In San Juan, the average high-temperature in November is essentially the same as in October - a still warm 83.1°F (28.4°C). Weather in November »

Weather in December

The first month of the winter, December, is still a warm month in San Juan, Puerto Rico, with an average temperature ranging between min 75.9°F (24.4°C) and max 80.8°F (27.1°C). In San Juan, Puerto Rico, the average high-temperature in December is relatively the same as in November - a still moderately hot 80.8°F (27.1°C). Weather in December »
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FAQ

What are the coldest months in San Juan?

The coldest months in San Juan are January and March, with an average high-temperature of 79.9°F (26.6°C).

How many days does it rain in San Juan?

In San Juan, during the entire year, the rain falls for 159.9 days and collects up to 12.01" (305mm) of precipitation.

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

January through March and December, with an average maximum UV index of 6, are months with the lowest UV index in San Juan, Puerto Rico.

What are the least humid months in San Juan?

The months with the lowest humidity in San Juan, Puerto Rico, are February and March, with an average relative humidity of 76%.

When is the ocean coldest in San Juan?

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

What is the driest month in San Juan?

The month with the least rainfall in San Juan, Puerto Rico, is April, when the rain falls for 12.4 days and typically collects 0.55" (14mm) of precipitation.

When is the highest UV index in San Juan?

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

What is the most humid month in San Juan?

The months with the highest humidity are May through July, with an average relative humidity of 79%.

When are the longest days in San Juan?

June has the longest days of the year, with an average of 13h and 13min of daylight.

What month has the most sunshine in San Juan?

June has the most sunshine of the year, with an average of 10.9h of sunshine.

What is the warmest month in San Juan?

August is the warmest month, with an average high-temperature of 85.1°F (29.5°C) and an average low-temperature of 79.2°F (26.2°C).

When is the ocean warmest in San Juan?

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

What is the wettest month in San Juan?

The month with the most rainfall in San Juan, Puerto Rico, is November, when the rain falls for 16.1 days and typically aggregates up to 1.57" (40mm) of precipitation.

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

The month with the shortest days is December, with an average of 11h and 2min of daylight.

Is there Daylight Saving Time (DST) in San Juan?

San Juan, Puerto Rico, does not observe Daylight Saving Time (DST). AST timezone is used over the entire year.

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

The month with the least sunshine in San Juan is December, with an average of 6.6h of sunshine.

Average temperature
San Juan, PR

Average temperature - San Juan, PR

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

The 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
San Juan, PR

Average pressure - San Juan, PR

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

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Average wind speed
San Juan, PR

Average wind speed - San Juan, PR

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
San Juan, PR

Average humidity - San Juan, PR

The months with the highest relative humidity are May, June and July (79%).
The months with the lowest relative humidity are February and March (76%).

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Average rainfall
San Juan, PR

Average rainfall - San Juan, PR

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
San Juan, PR

Average rainfall days - San Juan, PR

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
San Juan, PR

Average sea temperature - San Juan, PR

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 / Average sunshine
San Juan, PR

Average daylight / Average sunshine - San Juan, PR

The month with the longest days is June (Average daylight: 13h and 13min).
The month with the shortest days is December (Average daylight: 11h and 2min).

The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

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Average sunshine days
San Juan, PR

Average sunshine days - San Juan, PR

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
San Juan, PR

Average UV index - San Juan, PR

The months with the highest UV index are April, May, June, July, August, September, October and November (UV index 7).
The months with the lowest UV index are January, February, March and December (UV index 6).

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Average visibility
San Juan, PR

Average visibility - San Juan, PR

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

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