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 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).

Temperature

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). The average low-temperature, is 72.9°F (22.7°C).

Heat index

The average heat index in March is evaluated at a hot 92.8°F (33.8°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel', 'feels like', 'felt air temperature', or 'apparent temperature', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like wind, metabolic differences, pregnancy, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The least humid month is March, with an average relative humidity of 71%.

Rainfall

The month with the least rainfall in San Juan, Puerto Rico, is March when the rain falls for 12.2 days and typically collects 3.1" (79mm) of precipitation.

Ocean temperature

February and March, with an average ocean temperature of 79°F (26.1°C), are months with the coldest seawater in San Juan.
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In March, the average length of the day is 12.1h.

Sunshine

Months with the most sunshine are March and July, with an average of 9.1h of sunshine.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an extreme threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 12 interpret into the following advice:
Take all necessary precautions, as unprotected skin can burn in 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in March in San Juan?

The average high-temperature, in March, is 84.9°F (29.4°C), while the average low-temperature is 72.9°F (22.7°C). In March, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines air temperature and relative humidity, is appraised at 92.8°F (33.8°C).

What is the least humid month in San Juan?

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

What is the average humidity in March in San Juan?

In March, the average relative humidity in San Juan is 71%.

How much does it rain in San Juan in March?

In San Juan, Puerto Rico, in March, during 12.2 rainfall days, 3.1" (79mm) of precipitation is typically accumulated.

What is the driest month in San Juan?

March is the month with the least rainfall. Rain falls for 12.2 days and accumulates 3.1" (79mm) of precipitation.

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 water temperature in March in San Juan?

In San Juan, Puerto Rico, in March, the average water temperature 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.

What is the average length of the day in March in San Juan?

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

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

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

How long on average sun shines in March in San Juan?

In San Juan, Puerto Rico, the average sunshine in March is 9.1h.

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

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

What is the UV index reading in March in San Juan?

In San Juan, Puerto Rico, the average daily maximum UV index in March is 12. A UV Index value of 11, and more, symbolizes an extreme health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in March - San Juan, PR
  • Average high temperature in March: 84.9°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 March: 72.9°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 March - San Juan, PR
  • Average humidity in March: 71%

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

Average rainfall in March - San Juan, PR
  • Average rainfall in March: 3.1"

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 March - San Juan, PR
  • Average rainfall days in March: 12.2 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 March - San Juan, PR
  • Average sea temperature in March: 79.1°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 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: 9.1h

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 March - San Juan, PR
  • Average UV index in March: 12

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).