San Juan Weather in December

December in San Juan brings very high temperatures around 32°C (90°F) during the day, dropping to 17°C (63°F) at night, with the most rainfall of the year.

Rainfall in San Juan in December

Expect frequent showers this month, so make sure to have an umbrella to keep yourself dry. You can typically expect 4 days of rain this month, averaging around 40 mm (1.6 in). Although rain is not especially frequent, individual showers can still be quite heavy.

Temperature in San Juan in December

December in San Juan brings very high temperatures, with highs of 32°C (90°F) and nights around 17°C (63°F). Sunshine and humidity can make it feel even warmer than the raw temperature suggests. Nights cool down to 17°C (63°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in San Juan in December

The days are predominantly sunny, with an estimated total of around 350 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. March, April, May, June, July, August, September and October typically offer the best weather for San Juan.