Puerto Rico has no ideal window. No month clears the bar for comfortable travel outright, but Jan–Mar comes closest — rated fair rather than too hot, too cold or too wet.
Hurricane risk Aug–Oct
| Month | High °C | High °F | Rainy days | Verdict |
|---|---|---|---|---|
| January | 27.3 | 81 | 57% | Fair |
| February | 27.6 | 82 | 56% | Fair |
| March | 28.1 | 83 | 57% | Fair |
| April | 28.9 | 84 | 62% | Too wet |
| May | 29.3 | 85 | 77% | Too wet |
| June | 29.7 | 85 | 79% | Too wet |
| July | 29.9 | 86 | 81% | Too wet |
| August | 30.1 | 86 | 88% | Too wet |
| September | 29.9 | 86 | 91% | Too wet |
| October | 29.3 | 85 | 84% | Too wet |
| November | 28.2 | 83 | 77% | Too wet |
| December | 27.5 | 82 | 62% | Too wet |
Verdict combines mean daytime high with rainy-day frequency. “Rainy days” is the share of days in the month with at least 1 mm of rain.
February is the driest month, with rain on 56% of days and daytime highs near 27.6°C (82°F). September is the wettest, at 91%. Temperature barely moves all year — just 2.8°C between the warmest and coolest months — so rainfall, not heat, decides when to go. The record rules out too wet in Apr–Dec.