United States of America
San Juan sees feels-like daytime highs peak around 38.6°C in September and nighttime lows bottom out near 26.7°C in February. September is the wettest month (~117 mm), while February is the driest (~34 mm). For sunshine, January leads with about 81% clear skies.
Based on mild feels-like temperatures and low rain chances, the most comfortable months are February, January, and March — expect around 26.7–33.4°C with roughly 22% chance of rain on a given day in February.
| Month | Low / High °C | Rain % | Rainfall | Clear skies | Wind |
|---|---|---|---|---|---|
| January☀ | 26.8° / 33.6° | 23% | 35 mm | 81% | 19 kph |
| February☀ | 26.7° / 33.4° | 22% | 34 mm | 80% | 18.9 kph |
| March☀ | 27.7° / 34.7° | 25% | 37 mm | 78% | 18.3 kph |
| April | 28.3° / 36° | 33% | 57 mm | 66% | 17.3 kph |
| May | 29.6° / 36.6° | 45% | 99 mm | 39% | 17.2 kph |
| June | 31° / 38° | 35% | 69 mm | 32% | 18.6 kph |
| July | 31.3° / 38.4° | 34% | 59 mm | 38% | 19.8 kph |
| August | 31.3° / 38.4° | 42% | 85 mm | 37% | 18.5 kph |
| September | 31.4° / 38.6° | 49% | 117 mm | 32% | 16.3 kph |
| October | 31.4° / 38.6° | 48% | 116 mm | 36% | 15.4 kph |
| November | 30.1° / 37.2° | 43% | 97 mm | 54% | 17 kph |
| December | 28.3° / 35.1° | 29% | 52 mm | 73% | 18.6 kph |
Feels-like temperatures from long-term historical data; ☀ marks the most comfortable months (mild temperatures, low rain).
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