March weather forecast
San Juan, PR

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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 March

March in San Juan welcomes the onset of spring with a rise in temperatures. Noticeably, the month endures the highest amount of rainfall days at 12.8, registering a total of 0.87" (22mm) of rainfall. The sea temperature marginally rises to 79.1°F (26.2°C) in line with an increase in sunshine hours to 8.6 per day. Winds remain subtly tranquil albeit slightly more humid. These conditions make for a pleasant weather transition into the warmer months.

Temperature

Lowest temperatures in San Juan are observed in January and March, averaging a high-temperature of 79.9°F (26.6°C).

Humidity

February and March, with an average relative humidity of 76%, are the least humid months.

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

The months with the coldest seawater are February and March, with an average ocean temperature of 79°F (26.1°C).
Note: Water temperatures between 77°F (25°C) and 84.2°F (29°C) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.

Daylight

In San Juan, the average length of the day in March is 12h and 3min.
On the first day of the month, sunrise is at 6:42 am and sunset at 6:30 pm. On the last day of March, sunrise is at 6:18 am and sunset at 6:38 pm AST.

Sunshine

The average sunshine in March is 8.6h.

UV index

The months with the lowest UV index are January through March and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A typical high UV index of 6 in March suggests the following recommendations:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Notice! Sand and water reflections contribute to a stronger UV exposure.
Updated: Jul 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

San Juan witnesses its lowest temperatures during January and March, when the average high-temperature reaches 79.9°F (26.6°C).

What is the usual temperature for San Juan in March?

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

What is the least humid month?

February and March, with an average relative humidity of 76%, are the least humid months.

What is the average humidity in March?

In San Juan, the average relative humidity in March is 76%.

How much does it rain in San Juan in March?

In San Juan, during March, the rain falls for 12.8 days and regularly aggregates up to 0.87" (22mm) of precipitation.

What are the months with the coldest ocean?

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

How warm is the water in March?

In March, the average ocean temperature is 79°F (26.1°C). 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.

What is the average length of the day in March?

The average day length in March is 12h and 3min.

When is the sunrise / sunset in March?

In March, on the first day of the month, sunrise is at 6:42 am and sunset at 6:30 pm. On the last day of the month, in San Juan, sunrise is at 6:18 am and sunset at 6:38 pm AST.

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

The average sunshine duration in March in San Juan is 8.6h.

When is 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.

What is the UV index intensity in March?

In San Juan, the average daily maximum UV index in March is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation.

Average temperature in March
San Juan, PR

Average temperature in March - San Juan, PR
  • Average high temperature in March: 79.9°F

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).

  • Average low temperature in March: 73.9°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).

Average pressure in March
San Juan, PR

Average pressure in March - San Juan, PR
  • Average pressure in March: 30.01"Hg

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).

Average wind speed in March
San Juan, PR

Average wind speed in March - San Juan, PR
  • Average wind speed in March: 9.6mph

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).

Average humidity in March
San Juan, PR

Average humidity in March - San Juan, PR
  • Average humidity in March: 76%

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%).

Average rainfall in March
San Juan, PR

Average rainfall in March - San Juan, PR
  • Average rainfall in March: 0.87"

The wettest month (with the highest rainfall) is November (1.57").
The driest month (with the least rainfall) is April (0.55").

Average rainfall days in March
San Juan, PR

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 least rainy days is June (10.3 days).

Average sea temperature in March
San Juan, PR

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 / Average sunshine in March - San Juan, PR
  • Average daylight in March: 12h and 1min

The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 0min).

  • Average sunshine in March: 8h and 4min

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).

Average sunshine days in March
San Juan, PR

Average sunshine days in March - San Juan, PR
  • Average sunshine days in March: 11.9 days

The month with the most sunshine days is June (13.7 days).
The month with the least sunshine days is November (9.4 days).

Average UV index in March
San Juan, PR

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

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).

Average cloud cover in March
San Juan, PR

Average cloud cover in March - San Juan, PR
  • Average cloud cover in March: 31

The month with the most cloud cover is December (Cloud cover 35).
The month with the least cloud cover is September (Cloud cover 26).

Average visibility in March
San Juan, PR

Average visibility in March - San Juan, PR
  • Average visibility in March: 6mi

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).

San Juan, Puerto Rico, USA

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