The climate in Río San Juan during December can be summarized as hot, humid and very wet.
December is in the winter in Río San Juan and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 20°C (67°F) is normal.
|Daytime temperature||28°C 82.3°F|
|Nightly temperature||19.5°C 67°F|
|Average temperature||23.7°C 74.7°F|
|Daily sunshine||6 hrs|
|Avg rainfall||225 mm 8.8 ins|
|Rainy days||15 days|
|Sea temperature||27.3°C 81.1°F|
|Windspeed||8.6kph 5 mph|
On average December is the 2nd wettest month of the year in Río San Juan with around 225mm 8.8 inches of rain making it a very wet time to visit. This rainfall is typically spread over 15 days, although this may vary considerably.
On the flip side this corresponds to an average of 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 Río San Juan in December 2020.
|Hottest month:||June||31.4°C 88.5°F|
|Driest month:||February||103mm 4.1ins|
|Coldest month:||January||27.7°C 81.9°F|
|Wettest month:||November||268mm 10.6ins|