01 The Dry Season Rules
Here the temperature barely changes all year: it hovers around 27-30 °C at all times. What really varies is humidity and rain. Between December and April the drier air and clearer skies arrive, ideal for combining a beach morning with a city afternoon. It is by far the best season and also the busiest.
02 The Heat Decides the Day's Plan
In San Juan it is not about avoiding the heat, but ordering it. The midday sun on Old San Juan's cobblestones is fierce, so it is best to walk the city early or late in the afternoon, when the light drops and the stroll along the wall turns pleasant. Midday is for shade, water or a long pause; the street truly fills up when the heat eases.
03 Summer and Hurricanes
The Atlantic hurricane season runs from June to November, peaking between August and October. It does not mean a storm will hit your trip —many days are simply hot and humid, with short showers— but it does mean a higher chance of heavy rain and the odd tropical system. If you travel in those months, get insurance, follow the forecast and keep your plans flexible.
04 Verdict
The verdict is clear: for the best weather, travel between December and April, with February and March the safest bet. Mid-January adds an especially lively street atmosphere. May and November are reasonable shoulder months if you want fewer people. Avoid August and September if you can, not for the heat itself, but for the rain and hurricane risk.
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