In terms of precipitation, rainfall in San Juan ranges from 0.0 - 10.0 mm per month. January is typically the wettest month, when rainfall can reach 10.0 mm. April is typically the driest time to visit San Juan when rainfall is around 0.0 mm.
If weather is an important factor for your trip to San Juan, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of June, when temperatures are typically at their lowest (around 8.0 C).
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