Average Temperature in San Juan by Month

San Juan has a tropical monsoon climate, classified as Am in the Köppen system. The warmest month is June with an average high of 31°C, while the coldest month is February with lows dropping to 21°C. The annual temperature range of 10°C indicates a relatively stable climate year-round.

The driest month is March with only 9 rain days and 41mm of precipitation. For travellers, March through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 78% to 78% throughout the year.