Monthly 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 January

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

Weather in February

February, the last month of the winter, in San Juan, is another warm month, with average temperature fluctuating between 74.1°F (23.4°C) and 80.1°F (26.7°C). In San Juan, Puerto Rico, the average high-temperature is essentially 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 still a warm month in San Juan, Puerto Rico, with average temperature varying between 73.9°F (23.3°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 March »

Weather in April

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

Weather in May

May, the last month of the spring, in San Juan, is another warm month, with average temperature fluctuating between 82.4°F (28°C) and 76.6°F (24.8°C). In San Juan, Puerto Rico, 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

June, the first month of the summer, in San Juan, is still a warm month, with average temperature varying between 78.3°F (25.7°C) and 84.2°F (29°C). In June, the average high-temperature is relatively the same as in May - a still warm 84.2°F (29°C). Weather in June »

Weather in July

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

Weather in August

The last month of the summer, August, is also a moderately hot month in San Juan, Puerto Rico, with 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). The average heat index is calculated to a very hot 96.3°F (35.7°C). Weather in August »

Weather in September

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

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). In San Juan, the average high-temperature is essentially 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 also a moderately hot month in San Juan, Puerto Rico, with average temperature ranging between min 77.9°F (25.5°C) and max 83.1°F (28.4°C). In November, the average high-temperature is almost 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 also a moderately hot month in San Juan, Puerto Rico, with average temperature fluctuating between 80.8°F (27.1°C) and 75.9°F (24.4°C). In December, the average high-temperature is relatively the same as in November - a still moderately hot 80.8°F (27.1°C). Weather in December »
[Resources]

FAQ

What is the coldest month in San Juan?

The coldest months 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 is the month with the lowest UV index in San Juan?

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

What is the least humid month in San Juan?

Months with the lowest humidity in San Juan are February and March, with an average relative humidity of 76%.

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.

What is the driest month in San Juan?

April is the month with the least rainfall. Rain falls for 12.4 days and accumulates 0.55" (14mm) of precipitation.

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 most humid month in San Juan?

May through July, with an average relative humidity of 79%, are most humid months in San Juan, Puerto Rico.

When are the longest days in San Juan?

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

What month has the most sunshine in San Juan?

With an average of 10.9h of sunshine, June has the most sunshine of the year in San Juan, Puerto Rico.

What is the warmest month in San Juan?

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

What month 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 in San Juan, Puerto Rico, is December, with an average of 11h of daylight.

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

The month with the least sunshine 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).
Months with the lowest average high temperature are January and March (79.9°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).

[Resources]

Average pressure
San Juan, PR

Average pressure - San Juan, PR

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

[Resources]

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).

[Resources]

Average humidity
San Juan, PR

Average humidity - San Juan, PR

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

[Resources]

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").

[Resources]

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).

[Resources]

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).

[Resources]

Average daylight / Average sunshine
San Juan, PR

Average daylight / Average sunshine - San Juan, PR

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

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

[Resources]

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).

[Resources]

Average UV index
San Juan, PR

Average UV index - San Juan, PR

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).

[Resources]

Average visibility
San Juan, PR

Average visibility - San Juan, PR

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).

[Resources]