San Juan weather by month & the best time to visit
Puerto Rico · major coastal city · tropical — wet & dry seasons climate
The best time to visit San Juan is February — its sunniest month (Sunshine Score 86/100), with January and March close behind. San Juan averages about 2,619 hours of sunshine a year. Daytime highs around 28°C / 82°F and roughly 45 mm of rain in February.
When is the best time to visit San Juan?
For sunshine, the best time to visit San Juan is February, then January and March. The dullest month is September (67/100, 162 mm of rain). The full month-by-month picture is in the table below.
How sunny is San Juan?
San Juan gets a lot of sun: around 2,619 hours a year. February (86/100) is noticeably better than September (67). It ranks #6 of 7 destinations in Puerto Rico for annual sunshine, below the national median of 2,898 hours. The year's 1,207 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 85 | 28° / 82°F | 23° / 73°F | 51 mm | 7 | 27° / 81°F |
| February | 86 | 28° / 82°F | 23° / 73°F | 45 mm | 9 | 27° / 81°F |
| March | 83 | 28° / 82°F | 23° / 73°F | 61 mm | 10 | 27° / 81°F |
| April | 80 | 29° / 84°F | 24° / 75°F | 77 mm | 10 | 27° / 81°F |
| May | 71 | 30° / 86°F | 25° / 77°F | 129 mm | 10 | 29° / 84°F |
| June | 78 | 30° / 86°F | 26° / 79°F | 90 mm | 10 | 30° / 86°F |
| July | 76 | 30° / 86°F | 26° / 79°F | 100 mm | 10 | 30° / 86°F |
| August | 71 | 30° / 86°F | 27° / 81°F | 130 mm | 10 | 30° / 86°F |
| September | 67 | 30° / 86°F | 27° / 81°F | 162 mm | 10 | 30° / 86°F |
| October | 67 | 30° / 86°F | 26° / 79°F | 161 mm | 9 | 31° / 88°F |
| November | 69 | 29° / 84°F | 25° / 77°F | 137 mm | 7 | 30° / 86°F |
| December | 83 | 28° / 82°F | 24° / 75°F | 64 mm | 7 | 29° / 84°F |
Sea temperature in San Juan by month
The sea off San Juan is warmest in October at around 31°C / 88°F, and coolest in January at 27°C / 81°F. The water sits at a comfortable 21°C or warmer roughly all year round. Month-by-month sea-surface temperatures are in the Sea column of the table above.
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San Juan: questions and answers
What kind of destination is San Juan?
San Juan is a major coastal city in Puerto Rico with a tropical — wet & dry seasons climate — the sea reaches 31°C at its warmest and is swimmable (21°C+) year-round.
How many hours of sunshine does San Juan get a year?
San Juan gets about 2,619 hours of sunshine a year, at its best around February.
When is the best time to visit San Juan?
The sunniest time to visit San Juan is February, when the Sunshine Score peaks at 86/100 (with January and March close behind). Expect daytime highs around 28°C / 82°F.
What is the least sunny month in San Juan?
September is the least sunny month in San Juan, scoring 67/100 with about 162 mm of rain.
What is the sea temperature in San Juan?
The sea in San Juan ranges from about 27°C (January) to 31°C (October). Month-by-month sea temperatures are on this page.
How strong is the sun in San Juan?
The typical midday UV index in San Juan peaks around 10 (very high) in March, easing to about 7 (high) in January. Month-by-month midday UV values are in the UV column of the table on this page.
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