Climate almanac
San Juan
San José, Costa Rica · 9.96°, -84.08°
What is the weather like in San Juan in December?
In December, San Juan is typically 71°F (21°C) during the day and 59°F (15°C) at night. The month brings about 5.8 in (148 mm) of precipitation in total.
- Average high71°F (21°C)
- Average low59°F (15°C)
- Precipitation5.8 in (148 mm)
- Clear or mostly clear days10
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)