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

March 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
The first month of the spring, March, is still a warm month in San Juan, Puerto Rico, with average temperature fluctuating between 73.9°F (23.3°C) and 79.9°F (26.6°C).

Temperature

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

Humidity

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

Rainfall

In San Juan, in March, during 12.8 rainfall days, 0.87" (22mm) of precipitation is typically accumulated. In San Juan, during the entire year, the rain falls for 159.9 days and collects up to 12.01" (305mm) of precipitation.

Ocean temperature

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

The average length of the day in March is 12.1h.

Sunshine

In March, the average sunshine is 8.6h.

UV index

January through March and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: In March, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the coldest month 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).

What is the temperature in March in San Juan?

In San Juan, Puerto Rico, in March, the average high-temperature is 79.9°F (26.6°C), and the average low-temperature is 73.9°F (23.3°C).

What is the least humid month in San Juan?

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

What is the average humidity in March in San Juan?

The average relative humidity in March is 76%.

How many days does it rain in March in San Juan?

In San Juan, in March, during 12.8 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

What months are 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 in San Juan.

What is the ocean temperature in March in San Juan?

In March, the average ocean temperature in San Juan, Puerto Rico, is 79°F (26.1°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 March?

In March, the average length of the day in San Juan, Puerto Rico, is 12.1h.

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

The average sunshine in March is 8.6h.

What is the month 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.

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

The average daily maximum UV index in March in San Juan, Puerto Rico, is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in March - San Juan, PR
  • Average high temperature in March: 26.6°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 March: 23.3°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 March - San Juan, PR
  • Average humidity in March: 76%

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 March - San Juan, PR
  • Average rainfall in March: 22mm

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

Average rainfall days in March - San Juan, PR
  • Average rainfall days in March: 12.8 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 March - San Juan, PR
  • Average sea temperature in March: 26.1°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 March / Average sunshine in March - San Juan, PR
  • Average daylight in March: 12.1h

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 March: 8.6h

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 March - San Juan, PR
  • Average UV index in March: 6

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).