The climate in San Juan during December can be summarized as hot, humid and wet.
December is in the winter in San Juan and is typically the 4th coldest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 21°C (70°F) is normal.
|Daytime temperature||27.5°C 81.5°F|
|Nightly temperature||21.1°C 70°F|
|Average temperature||24.3°C 75.7°F|
|Daily sunshine||7.6 hrs|
|Avg rainfall||151 mm 5.9 ins|
|Rainy days||21 days|
|Sea temperature||27.3°C 81.2°F|
|Windspeed||15.5kph 10 mph|
On average December is the 5th driest month of the year in San Juan with around 151mm 5.9 inches of rain making it a wet time to visit. This rainfall is typically spread over 21 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.6 hours of sunshine per day.
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in San Juan in December 2022.
|Hottest month:||August||30.2°C 86.4°F|
|Driest month:||March||79mm 3.1ins|
|Coldest month:||February||26.9°C 80.4°F|
|Wettest month:||August||195mm 7.7ins|